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Discussion Starter #1
Hey guys, hoping someone will be able to offer me some advice here. When i bought the truck the A/C was blowing through the vents, it wasnt very cold, but it was there. The truck sat for about a week because i had to change the rear shackles and hangars, gas tank, along with the manual hubs up front.

Long story short, the vents arent working at all anymore. No air is coming through on AC, vent, heat, all speeds, nothing. Anyone know what i can start to look at, or replace to fix this?

Thanks! :rockon

96 Ford Bronco 5.0L
 

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Welcome to FSB!

The most common vent problem is a vacuum hose failure in the engine compartment. Try this:

1. Under the hood, on the passenger side, near the firewall, is a round silvery looking thing with an arm on it. This is the vacuum motor that moves the blend air door. There is a white vacuum line attached to it (or should be). The vacuum line looks like a wire, as it is plastic, but it is a vacuum line.
2. Grab the vacuum line and pinch it, it will most likely fall apart in your fingers.
3. Go to the auto parts store and get a couple of feet of rubber vacuum line.
4. Remove the vacuum line off the vacuum motor (the silvery thing). Use a knife to cut the connector off it, it might be stuck really well and you don't want to break the connector part of the motor.
5. Trace the vacuum line back toward the firewall and untape the loom that the line goes into.
6. Under the loom, the white vacuum line will probably be fine, put a little dish soap over the white plastic line and slip the new rubber vacuum line over it as far as you can. (an inch or two).
7. Push the other end of the line over the connector tube of the vacuum motor.
8. Tape up the loom
9. Should be good to go!
 

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yo, as MIKEY ADVISED w/great advice;

this is by Ford fyi,
"...The air handling system is designed to provide defrost when no vacuum is applied to any of the three air door vacuum motors. This is done to prevent a situation where defrost cannot be obtained due to a system vacuum leak. Instead, a leak in the vacuum control circuit will send all airflow to the defroster outlets. This condition may occur during acceleration (slow leak), may exist at all times (large leak) and may happen only when certain specific functions are selected, indicating a leak in that portion of the circuit. ..." from Bronco Workshop Manual
Source: by Ford

The vacuum motor that moves the blend air door is cited by Ford as Outside Recirculate Door Vacuum Motor (w/White vac line, but a PO or shop may have replaced it w/std balck hose)

Outside Recirculate Door Vacuum Motor (White , also called the Vacuum Control Valve) Location pic

by JohnMcD348

Also, for posterity & FYI;
Climate Control Assembly in a 96: "...The heater is a blend air type that receives its outside air supply from the cowl inlet. The heater control (18549) is located in the instrument panel (04320) to the right of the steering column. It includes the function control knob, temperature control knob and heater blower motor switch (18578). The heater blower housing assembly includes: Blower motor (18527), Heater blower motor switch resistor (18591), A/C damper inlet door (19C802), Vacuum control motor (18A318) to operate A/C damper inlet door, Electrical harness. The heater blower housing is installed on the engine compartment side of the dash panel. Electrical wire receptacles for the blower motor and heater blower motor switch resistor are provided on the heater plenum chamber case (18A484) and a vacuum connection is provided on each vacuum control motor. heater air plenum chamber (18471), on the passenger compartment side of the dash panel attaches to the heater plenum chamber case through the panel with an air passage between the assemblies provided through an opening in the panel. heater air plenum chamber includes the following components: Heater core (18476), Temperature blend door, Floor/panel door, Floor/defrost door, Vacuum control motors and vacuum hose harness (19C827). The vacuum control motors and their vacuum lines operate the floor/defrost and floor/panel doors. The temperature blend door is operated mechanically by a A/C temperature cable (19988) attached to the temperature control knob in the heater control. The function control knob is used to select the functional setting of the heater system. The settings are: VENT, FLOOR, OFF, MIX and DEFROST. Power is supplied to the blower motor when the function knob is in any position except OFF. Airflow Control: Outside air is supplied to the system through the cowl top grille. This air supply enters the heater plenum chamber case where the blower motor directs some or all air through or around the heater core depending upon the setting of the temperature control knob. Airflow through the heater air plenum chamber is determined by the setting of the function selector knob in the heater control. The outlets through which air may be distributed into the passenger compartment are shown in the following illustration. Temperature Control: Depending upon its position, the temperature blend door in the heater air plenum chamber directs a given amount of air through the heater core to provide a desired amount of heat. If the amount of air directed by the blend door through the heater core is reduced, less heat will be directed into the passenger compartment. Conversely, a fully open blend door, in response to a fully WARM setting of the temperature control knob, will provide maximum heat into the passenger compartment. Blower Motor Control: Three of four operating speeds (LOW, MEDIUM LOW and MEDIUM HIGH) are controlled by a heater blower motor switch resistor connected in series with three of the operating positions and the ground. The MEDIUM LOW and MEDIUM HIGH positions on the heater control are identified by dots on the control. With the heater blower motor switch in its LOW position, current flow in the ground circuit passes through three of the coils in the heater blower motor switch resistor. In MEDIUM LOW, current flows through two coils. In MEDIUM HIGH, current flows through one coil. In HIGH, current flow in the motor ground circuit bypasses the heater blower motor switch resistor to provide maximum speed. Recirculation/Fresh Air Control: The vehicle heating system draws outside air into it and distributes this fresh air throughout the passenger compartment in all positions except OFF. If the vehicle is equipped with air conditioning, outside air is distributed throughout the vehicle in all positions except OFF and MAX A/C. In these positions (OFF, MAX A/C) the A/C fresh air inlet door is in the closed position and air within the passenger compartment is recirculated hroughout..."
Source: by Ford

Control Overview in 80-86; "Off- Vacuum is applied to da Outside Recirc Door Vac Motor, closing that door to outside Air. Normal A/C - Outside-Recirc Door is open to outside air. The panel door directs air to the instr panel registers. The Temperature Control Lever moves a cable connected to da Temp Blend Door that mixes heated & un-heated air In Defrost Mode; with No vacuum to any vacuum "motor" (cannisters looking thangs), air Flows to Defroster outlets (& air compr clutch is engergized) Vent - Outside-Recirc Door is open to outside air, as in Normal A/C. Vacuum is applied to the Panel Door Vacuum Motor, letting air flow only to the instr panel registers. In the same way, the defroster outlets are closed by the Floor/Defrost Vacuum Motor. Floor - The Outside-Recirc Door is Open to outside air. With No Vacuum at the Panel Door Vacuum Motor. The Panel Door directs air to the floor outlets. Mix - Vacuum is applied only to Port A of the Floor/Defrost Vacuum Motor positioning the Floor/Defrost Door at mid-position. Air Flow is split between the floor & windshield. There is no vac at the Panel Door Vacuum"
Source: by miesk5 at http://fullsizebronco.com/forum/showthread.php?t=187609


Vacuum Line/Hose;"...The vacuum hoses used in the passenger compartment control circuit are constructed from PVC plastic material. The vacuum hoses used in the engine compartment are constructed of Hytrel. Because of the materials used, the vacuum hoses should never be pinched off during diagnosis to locate a leak. Use Rotunda Vacuum Tester 014-R1054 or equivalent to locate vacuum leaks. A wood golf tee can be used as a plug when it is necessary to plug one end of a vacuum hose for leak test purposes..." from F-150, F-250, F-350, F-Super Duty and Bronco, F-Super Duty Motorhome Chassis Workshop Manual
Source: by Ford

Vacuum Leak Test; On an idling engine check for vacuum leaks using a mechanic's stethoscope with the probe removed, or a ~3' garden hose section. On COLD ENGINE only, use propane torch w/rubber hose attached, UNLIT or spray carb cleaner, when it gets to the the leak the RPMs will rise. Also check: vacuum hoses; intake manifold gasket & throttle body; Tree Location pic in a 94 5.8 Source: by joelb23 at SuperMotors.net; PCV pic by Bbronco311. Vacuum Reservoirs: EGR Sys Vacuum Tank & 2ndry air (looks like a coffee can in earlier years) Depiction & Location in Parts Break-Out Diagram in a 96 w/Ford part numbers by Ford via miesk5 at http://www.broncolinks.com/gallery_i...6TABTAB5.0.jpg; Thermactor Air Bypass Solenoid (TAB, AIRB, AM1) w/Pink vacuum line & Air Bypass Valve (AIR BPV) & Thermactor Air Diverter Solenoid (TAD, AIRD, AM2) w/Yellow vacuum line & Air Diverter Valve or Air Control Valve (ACV) see my site @ http://www.broncolinks.com/index.php?index=416 & EGR Vacuum Regulator (EVR); also called EGR Vacuum Solenoid & EGR Valve Position (EVP) - MIESK5 NOTE: EVP is used on all years except for 95 5.8L California models & all 96, they use the DPFE Sensor instead of EGR Valve Position Sensor (EVP) etc, see my site @ http://www.broncolinks.com/index.php?index=146. AC, heater, defroster, vent control ckt & vacuum tank (plastic ball, or an irregular box glued to the evaporator cover), under dash & lines to heat/blend/etc. doors; & HVAC vacuum reservoir; Vacuum Tank pic, Ford part number 19A566; on side of evaporator housing by Ford via miesk5 at FSB. Carbon Canister (Charcoal Canister, Vapor Canister, Evaporative Emission (EVAP) Canister for the Evaporative System (see http://fullsizebronco.com/forum/atta...1&d=1315917794. & Line to & the power brake booster, Master Cylinder & Booster Location pic in a 93 by Steve83. ; and line to & Cruise Control sys in 86-91.
 

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Their are a bunch of vaccum lines inside the truck, laying on the floor on the passenger side look up under the dash and you'll see them. Behind the kick panel on the passenger side is where I'd start and trace them and make sure their hooked up. Honestly the under hood fix that was already mentioned doesnt sound like your symptoms, it should turn on even if that line is broken. The knob for vent, a/c, defrost may be stripped out, the metal inserts work loose over time and replacement is easy. If none of this fixes it, let us know and we'll give you some more things to check.
 

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Discussion Starter #6
So i took a look at all the hoses, lines, plugs, and knobs, and all seems to be in order. My next guess is that the blower motor is dead. Even when you turn on defrost for example, you hear the vents (doing that popping noise). Its just simply not blowing air...
 

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So i took a look at all the hoses, lines, plugs, and knobs, and all seems to be in order. My next guess is that the blower motor is dead. Even when you turn on defrost for example, you hear the vents (doing that popping noise). Its just simply not blowing air...
=

yo MELLIS,
Motor & Wheel Removal & Installation in a 96; from 1996 F-150, F-250, F-350, F-Super Duty and Bronco, F-Super Duty Motorhome Chassis Workshop Manual; "...Removal: Disconnect battery ground cable(s). On California vehicles, remove emission module forward of blower motor (18527). Disconnect wire harness connector from blower motor by pushing down on connector tabs and pulling connector off blower motor. Disconnect blower motor housing tube (19A786) at blower motor. Remove four screws attaching blower motor to heater plenum chamber case (18A484). Holding blower motor housing tube, pull blower motor from heater plenum chamber case and remove it from vehicle. If the blower motor wheel (18504) is to be installed on the new blower motor, remove the retainer and then gently pull the blower motor wheel from the shaft. Installation: NOTE: When the battery (10655) has been disconnected and reconnected, some abnormal drive symptoms may occur while the powertrain control module (PCM) (12A650) relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 miles) or more to relearn the strategy. Follow removal procedures in reverse order..."
Source: by Ford
Check for op and if ok by jumoing to 12v; check switch and Resistor Pack.
Wiring Diagram in a 96


Blower Motor Location pic by Steve83; same for the 96


Resistor Pack Removal & Installation in a 96; from 1996 F-150, F-250, F-350, F-Super Duty and Bronco, F-Super Duty Motorhome Chassis Workshop Manual; "...Removal: Pry the wire connector from the heater blower motor switch resistor (18591). Remove the two screws that attach the heater blower motor switch resistor to the heater plenum chamber case (18A484). Installation: Follow removal procedures in reverse order. Check operation in all blower speeds..." see depiction 4394a at end of this reply
Source: by Ford
Location pic in a 93 5.8
Source: by Steve83 (Steve, That dirty old truck) at http://www.supermotors.net/registry/media/148977

Leaf & Debris Build-Up Location pic in 80-96 Blower Motors & Ducts
Source: by Steve83 (Steve, That dirty old truck) at http://www.supermotors.net/clubs/superford/vehicles/registry/media/71652
 

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being as im in an ac class now, lemme help

heres a step by step way to diagnose your ac system

1- start engine, turn ac to max ac on the coldest setting.

2- pop hood and look at the ac clutch, is the clutch engaging? if the clutch isnt engaging and you see even pressures at approx 70 or 80, its an electrical issue with either the relay or the fuse or possibly the switch. if the pressure is lower then described and the clutch isnt engaging then add some refrigerant and see if the clutch engages then. if the clutch is engaging and no cold air then check pressures. the high side should be approx 170 and the low side should be approx 30. if they are lower then you are low on refrigerant add a small can from autozone and try again. if they are higher then you have too much in the system and it isnt able to cool efficiently. you'll need to remove some to get it to cool properly. if you see other weird things like ice in weird locations or strange pressures that dont make sense at all, PM me i'll help you out.

3- if pressures are good and clutch is engaging, check your diverter door. this door is what pulls air from either the inside of the cab or outside air. and this typically only recirculates on max ac. on other cars this is a setting you can change from time to time depending. the vacuum actuator for this door is located in the engine bay on the rear passenger side corner. you can check this by turning the setting to vent, checking the actuator, then moving it back to max and checking again. it should have moved between those 2 settings, if not then your actuator is bad OR you have a bad line to that actuator.

4- try different settings. will it blow on only one setting? or on 2? or none. if it blows on all but high then your blower motor relay is bad. if if blows on none of the selections then your blower fuse is bad or the motor itself is bad, or possibly the switch failed. or again then possibly the relay is bad.

5- your blend door. on our trucks this is cable operated and is located under the dash and you should be able to access this by removing the glove box. your temperature problem may have been a blend door that isnt in the proper spot, possibly the cable slid and it isnt in adjustment anymore and your blowing air through the evaporator then through the heater core which would produce a higher then normal temperature

6- you also want to check the other doors. you can find the vacuum actuators for these under the dash. you could have one of them stuck open or closed and its blocking air flow or directing it to the floor or to defrost rather then vent.

i would suspect its either the blower itself or its the wiring associated with it. use the wiring diagram that meisk posted before me to determine what you need. were lucky that the wiring diagram for these trucks is so simple. some trucks the same year but different makes are wayyy more complex and involve so much more crap then they really need to function but its all in design i suppose..
 

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yo 1995,
Good stuff! Maybe you can use this for your Classes and future use
This is by Ford in 1996 Bronco Workshop Manual
DESCRIPTION AND OPERATION
Climate Control Assembly
The heater is a blend air type that receives its outside air supply from the cowl inlet. The heater control (18549) is located in the instrument panel (04320) to the right of the steering column. It includes the function control knob, temperature control knob and heater blower motor switch (18578).

The heater blower housing assembly includes:
Blower motor (18527)
Heater blower motor switch resistor (18591)
A/C damper inlet door (19C802)
Vacuum control motor (18A318) to operate A/C damper inlet door
Electrical harness
The heater blower housing is installed on the engine compartment side of the dash panel. Electrical wire receptacles for the blower motor and heater blower motor switch resistor are provided on the heater plenum chamber case (18A484) and a vacuum connection is provided on each vacuum control motor.
A heater air plenum chamber (18471), on the passenger compartment side of the dash panel attaches to the heater plenum chamber case through the panel with an air passage between the assemblies provided through an opening in the panel.
The heater air plenum chamber includes the following components:
Heater core (18476)
Temperature blend door
Floor/panel door
Floor/defrost door
Vacuum control motors and vacuum hose harness (19C827)
The vacuum control motors and their vacuum lines operate the floor/defrost and floor/panel doors. The temperature blend door is operated mechanically by a A/C temperature cable (19988) attached to the temperature control knob in the heater control.

The function control knob is used to select the functional setting of the heater system. The settings are: VENT, FLOOR, OFF, MIX and DEFROST. Power is supplied to the blower motor when the function knob is in any position except OFF.

Airflow Control
Outside air is supplied to the system through the cowl top grille. This air supply enters the heater plenum chamber case where the blower motor directs some or all air through or around the heater core depending upon the setting of the temperature control knob. Airflow through the heater air plenum chamber is determined by the setting of the function selector knob in the heater control. The outlets through which air may be distributed into the passenger compartment are shown in the following illustration.

Air Distribution
see diagram below

Item Part Number Description
1 19E726 A/C Instrument Panel Duct and Support
2 04320 Instrument Panel
3 18C433 Heater Outlet Floor Duct
4 Instrument Panel Ducts (2) Driver's Side (Part of 19E726)


Temperature Control
Depending upon its position, the temperature blend door in the heater air plenum chamber directs a given amount of air through the heater core to provide a desired amount of heat. If the amount of air directed by the blend door through the heater core is reduced, less heat will be directed into the passenger compartment.
Conversely, a fully open blend door, in response to a fully WARM setting of the temperature control knob, will provide maximum heat into the passenger compartment.


Blower Motor Control
Three of four operating speeds (LOW, MEDIUM LOW and MEDIUM HIGH) are controlled by a heater blower motor switch resistor connected in series with three of the operating positions and the ground. The MEDIUM LOW and MEDIUM HIGH positions on the heater control are identified by dots on the control.
With the heater blower motor switch in its LOW position, current flow in the ground circuit passes through three of the coils in the heater blower motor switch resistor. In MEDIUM LOW, current flows through two coils. In MEDIUM HIGH, current flows through one coil. In HIGH, current flow in the motor ground circuit bypasses the heater blower motor switch resistor to provide maximum speed.

Recirculation/Fresh Air Control
The vehicle heating system draws outside air into it and distributes this fresh air throughout the passenger compartment in all positions except OFF. If the vehicle is equipped with air conditioning, outside air is distributed throughout the vehicle in all positions except OFF and MAX A/C. In these positions (OFF, MAX A/C) the A/C fresh air inlet door is in the closed position and air within the passenger compartment is recirculated throughout.

More 96 and other year HVAC LINKs in my site @ http://www.broncolinks.com/index.php?index=21
=====

Have a Great Thanksgiving Friends!
 

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where on earth do you come up with this info. not just here but in other threads ive seen that you've posted on its always the longest reply and you always have the most information
 

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yo 1995f1504x4,
I have the 96 Bronco Powertrain Controls and Emission Diagnosis (PCED), Electrical and Vacuum Troubleshooting Manual (EVTM) on CD.
I use other references also such as;
Auto Repair Reference Center Repair Manual, Mostly Chilton; many local library's offer free online access for their members; just log-in w/your library Card # and password; incl. all Broncos, & many MAKES! 1951 to current; some years (85-Current, I believe) include: FULL Technical Service Bulletins and Recalls, Labor Hours per repair (plug in appl info); some Wiring Diagrams, Vacuum Diagrams (in DRIVEABILITY AND EMISSIONS CONTROLS Section), Specifications (torques, etc.) & Maintenance Intervals
Source: by arrc at http://search.ebscohost.com/

My local library went from Chilton-online from home to All Data, but it is in-library use only
Other Libraries offer Chilton on-line from home using your library Card # and password

Chilton Manual for 66 - 81 Bronco, Partial, Scanned Copy
Source: by Chilton via broncocity.com http://www.broncocity.com/66_81_manual.htm

Repair Guides & Wiring Diagrams (click vehicle, year range) & go to Chassis Electrical & scroll for Wiring Diagrams...(under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via Autozone http://www.autozone.com/autozone/


Electrical and Vacuum Troubleshooting Manual (EVTM) Partial, Bronco for 86; Speed Control on pages 135-139, A/C & Heater on pages 140-145, Radio on pages 127-129
Source: by Ford via Chris B (Blue, bronco boy) at http://chrisb.users.superford.org/Bronco/Misc/

and many other references by folks here, in SM, and other sites; seacrh for EVTM in my site using the internal search function. Many LINKs will be repeated because they are used in Multiple Sections.. so have patience and scroll
or go to the System/Component you seek info about and use Browser's Find function for EVTM
:thumbup
 

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I just wanted to bookmark this for a rainy day. Good info here
yo,
Due to issues affecting some member web sites now and in the past, I copy to my PC all relevant info on my year Bronco. It's always good to have printable material on hand and not rely on a site or an ISP/Host to be up, say on a weekend or during a storm.:thumbup
 

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Discussion Starter #14
I think im going to take apart the whole blower motor housing and make sure its not clogged with any crap Ill use this as a reference... think this will help?? If not i might just get a whole new one from a junkyard or something. I could buy just a new blower motor (33$ @ autozone) but what if its something else?



 

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yo MELLIS

for the 92-96 (this is from the 96 Workshop Manual)

Blend Door (Temperature Control) Control Cable Replacement in a 96
see Temperature Control Cable Plenum Attachment diagram below # m5193a

Item Part Number Description
1 19988 A/C Temperature Cable
2 18471 Heater Air Plenum Chamber
3 56950-S2 Screw
4 18C581 A/C Plenum Vacuum Harness
5 18C433 Heater Outlet Floor Duct
6 45261-S2 J-Nut
7 01610 Dash Panel
8 56956-S2 Screw
9 N801969-S2 Nut
A � Tighten to 2.5-3.0 Nm (22-27 Lb-In)

Release the glove box to gain access to the retainer clips on the plenum end of the cables. Depress protruding retainer clip and pull upward to free from plenum
NOTE: Removal of the A/C temperature cable (19988) from the heater control (18549) is easiest if temperature control is removed from the heater control.

Remove heater control from instrument panel (04320) far enough to gain access to the cable assembly. Refer to Climate Control Assembly under Removal and Installation in this section. SEE BELOW
Remove the hex-head screw retaining the temperature control switch (with beveled gears) to the heater control.

Remove the temperature control knob (18519) and rotate the temperature control switch clockwise until it is free from the retaining tab in the heater control and remove the temperature control switch from the heater control.

Release the A/C temperature cable assembly from the temperature control switch by inserting Temperature Control Cable Removal Tool T94P-18532-A and using a small flat-bladed screwdriver, release the third retaining tab while pulling the cable assembly free.

Remove A/C temperature cable. Pay particular attention to cable routing to aid in installation.

Installation

NOTE: All replacement service parts are shipped in the full warm position and must remain in full warm to permit proper alignment during installation. Cables are serviced as a complete assembly only.



Route A/C temperature cable in same manner as cable removed.

Position temperature control knob in full warm.

Install temperature control switch in heater control and position A/C temperature cable so that all three retaining tabs and the beveled gearing is properly aligned. Be sure all components are adjusted to the full warm position.

Push A/C temperature cable onto temperature control switch until it is fully seated and all retaining clips are engaged.

Install heater control.

Working through glove box opening, position temperature blend door in the full warm position.

Align A/C temperature cable to locating post, align cable assembly hardshell positioning tab with keyed area on the heater air plenum chamber (18471) and the temperature blend door actuator post aligned with the cam on the cable head.

Push assembly onto plenum until retaining tab is engaged. Install retaining bracket.

Rotate the temperature control knob and check for operation of the temperature blend door.

=========
Door Replacement in 92-96 (Other than Blend): "...The damper doors inside the heater air plenum chamber (18471) cannot be replaced. As a result, if there is a problem in the mix or the panel/defrost door, the heater air plenum chamber, including these doors, must be replaced. The heater air plenum chamber must also be replaced if there is damage to the mounting studs that cannot be repaired..."

=======

Floor Panel Door, Temperature Blend Door (Cable Controlled), Floor & Defrost Door etc. Location w/Vacuum Line Colors in Diagram #m4193e
Item Part Number Description
1 18476 Heater Core
2 19A566 A/C Vacuum Reservoir Tank and Bracket
3 19A563 A/C Vacuum Check Valve
4 � Outside-Recirc. Door (White) (Part of Vacuum Harness)
5 � Vacuum Harness Connector (Part of Vacuum Harness)
6 � Temperature Blend Door (Cable Controlled) (Part of 18471)
7 � Floor/Panel Door (Part of 18471)
8 � Panel Vacuum Motor (Part of 18A318)
9 � Floor/Defrost Door (Red/Yellow) (Part of 18471)

========

Climate Control AssemblyRemoval

Disconnect the battery ground cable(s).

Remove the trim strip above the heater control (18549) and glove compartment area.

Remove the two screws that attach the center finish panel to the instrument panel (04320) to gain access to the four screws that attach the heater control to the instrument panel. Refer to Section 01-12.

Remove the four screws. Then, pull the heater control far enough through the opening in the panel to allow disengagement of the electrical connectors for the heater blower motor switch (18578) and control illumination lamps, etc.

Disconnect the electrical harness connectors from the heater blower motor switch and illumination connectors on the heater control.

Remove the connector from the stowage notch in the heater outlet floor duct (18C433). Disconnect the vacuum hose harness (19C827) from the connector.

Pull heater control away from instrument panel far enough to install Temperature Control Cable Removal Tool T94P-18532-A on the A/C temperature cable (19988) connector on the backside of the heater control.
Using a small flat-bladed screwdriver, lift the third locking tab as indicated in the following illustration and remove the A/C temperature cable by pulling straight back.
see diagram #m5304a

Temperature Cable Removal
Move the heater control from the instrument panel.

Installation
Pull the A/C temperature cable through the opening in the instrument panel for a distance of approximately 200mm (8 inches).
Hold the heater control near the instrument panel. Attach the A/C temperature cable to the gear rack.
Place the heater control back to the position it occupies for insertion into its opening. Snap the bullet end into the bracket. Be sure that the end is firmly seated.
Connect the wire harness to the heater blower motor switch and control illumination lamp. Attach the vacuum hose harness to the heater control and to the plenum harness.
Attach the connector to the stowage notch in the heater outlet floor duct.
Position the heater control into its opening while being careful that the vacuum hose harness and electrical harness are properly stowed and install four retaining screws.
Install center finish trim panel with two attaching screws.

Install the trim strip above the heater control and glove compartment area after installing the two retaining screws.
NOTE: When the battery (10655) has been disconnected and reconnected, some abnormal drive symptoms may occur while the powertrain control module (PCM) (12A650) relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 miles) or more to relearn the strategy.
Connect the battery ground cable(s).
Check the system for proper operation.

===================

Heater Control, Rearview
see diagram #m4195e
Item Part Number Description
1 14401 Main Wiring (to Function Selector Switch)
2 19D816 A/C Temperature Control Bracket
3 18549 Heater Control
4 19988 A/C Temperature Cable
5 N803877-S36B Screw (4 Req'd)
6 14401 Main Wiring (to Blower Switch)
7 14401 Main Wiring
 

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yo.
Diagram m4195e
Heater Control, Rearview

Item Part Number Description
1 14401 Main Wiring (to Function Selector Switch)
2 19D816 A/C Temperature Control Bracket
3 18549 Heater Control
4 19988 A/C Temperature Cable
5 N803877-S36B Screw (4 Req'd)
6 14401 Main Wiring (to Blower Switch)
7 14401 Main Wiring
 

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yo
I don't know why these last few diagram did not appear; they did dnld ok but...
Temperature Cable Removal diagram #m5304a
 

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yo MELLIS,

yw

Cme back and ask more on this
or if you find the prob, post the info here for others.
 

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I have a 1995 Eddie Bauer, and have the same issue with my a/c control vents, blowing my air up from the dash vents to the defrost vents. I have changed the White Vaccum line from Outside Recurc thingamagic to the HVAC pac of vaccum lines under the glovebox, inside passenger kick panel. The problem remains. I drive down the road with cold air alternating from Defrost vent to dash vents. what do I do now?
 
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