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Discussion Starter · #1 ·
my blower doesn't work properly. It only works on one setting, high, but that doesn't seem very high. This is my first bronco. Is the blower moter shot? I replaced the blower switch, but the same issue continues. What about the blower resistor. I don't even know exacly what that does. Napa sells the blower moter resitor wiring plug, but not he resistor it self. Anyone have any insight?
 

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Yes, it's the resistor. It's in the engine bay between the accumulator and the blower motor. If you can't find one locally, I think I have one in the junkpile.

 

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I had this exact same problem not a week ago. I had to replace my motor (I think the motor caused my resistor to go bad, I only had high, then lost it all entirely...$22 at AutoZone) and I replaced the fuse ($1) and I replaced the resistor pack(which was very hard to find new. I got mine eventually from a Ford Dealer for $17) so $50 and an hour later I am fine.....good luck, it's not hard once you have the parts.....

P.S. you probably ONLY need the resistor, just mentioned the motor because that was MY problem
 

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Yeeeeehaw Y'all!
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Now that is just a great friggin pic...... :thumbup

I've got the same problem on my 88, (only blows on hi), but since it blows, it's been a little low down on the priority fix list. But now that I know what it probably is and where to look for the problem, I'm going to fix it.

Thanks Steve......

Steve83 said:
Yes, it's the resistor. It's in the engine bay between the accumulator and the blower motor. If you can't find one locally, I think I have one in the junkpile.

 

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Who needs oil anyways....
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Depending on the year, it might be prone to collecting leaves in the ductwork. Check there. They would all start piling up at the bottom which you can easily access if you remove the front plastic wheel well. Cleaning just the passenger side on my 86 made a world of difference. There was also crap in the ductwork near the heater core.
 

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Aikidoka said:
...leaves in the ductwork.
That's very common in all years, but fairly easy to check. When you have the resistors out (green pointer), just look in the hole. If it's packed or if the resistors have leaves in them, pull the blower motor (yellow pointer) and reach in to clean them out by hand. If it's REALLY bad, pull the evaporator (inside the big plastic cover facing the R exhaust manifold; bottom pic) and hose it out. If you can't reach the rubber cleanout at the corner of the firewall (red pointer), you'll have to pull the kick panel and the unpainted plate (with 4 hex-head screws) to get those out.


 

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Discussion Starter · #7 ·
Thanks Steve,

I finally hit the junkyard and picked a new Resistor for $1. Blower works great now.

Next Step A/C.

Anyone do a recharge?
 

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Charlie don't surf..
'92 Ford Bronco XLT
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dusting off an old thread..got in my rig this afternoon, it was raining so after starting it up I switched to defrost..fan was on the low setting but the blower motor was going like I had it turned on high..same on every setting..I'm assuming it has to be the blower motor resistor..funny thing is I just replace one in my Crown Vic a couple of weeks ago..
 

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Charlie don't surf..
'92 Ford Bronco XLT
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Picked up a new blower resistor from NAPA today and expected that would cure the problem..got it installed and turned the vent on, same thing..fan is blowing on high all of the time..now I guess it's possible the resistor I got from NAPA was bad but I'm thinking the problem lies elsewhere..any other thoughts?
 

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Does the blower still run at full speed with the resistor assembly removed? If so, you probably have a short on the motor ground side. Either between the resistor pack and the blower motor, or at the blower motor switch.
Pull the connector off the resistor pack and check.

Below is the EVTM schematic for a '94 if you think the wiring colors/connectors are close enough.



http://www.supermotors.net/registry/media/909464_1
 

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Charlie don't surf..
'92 Ford Bronco XLT
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don't know..I'll check it tomorrow..this is exactly what I was looking for, couldn't seem to find it in my Haynes..thanks.:thumbup
 

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Picked up a new blower resistor from NAPA today and expected that would cure the problem..got it installed and turned the vent on, same thing..fan is blowing on high all of the time..now I guess it's possible the resistor I got from NAPA was bad but I'm thinking the problem lies elsewhere..any other thoughts?
Hey ! I'm just a the retard that works at the local...wait, make that multi-national... auto parts store:banghead. But I'll tend to agree with Mikey on this one. It sounds to me like the blower switch itself may be the problem .
 

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fan was on the low setting but the blower motor was going like I had it turned on high..same on every setting..I'm assuming it has to be the blower motor resistor.
No, the "fan only works on high" description means all fan switch positions are dead, except high, which works as it should. That's invariably caused by the thermal fuse in the resistor burning open, leaving the only working circuit the one that bypasses the resistors & puts full power to the motor.

Your symptom is "all switch positions cause high fan speed", which suggests the fan switch has failed internally, or the wiring between it & the resistor is shorted. Unplug the resistor and test continuity from each pin to each other. With the switch in LOW, all should be open (infinite resistance). If not, pull the fan control out of the dash to inspect the switch & retest the wiring with both ends unplugged.
 

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yo,
Check continuity of blower switch.
TEST PROCEDURE
Switch Position.....Continuity Between Terminals
Low...........B
Medium 1.....B + D
Medium 2....B + C + D
High..........B + A + C
Is switch continuous in all positions?
Yes - SERVICE Circuit 57 (BK) between switch and ground.
REPAIR as necessary. G201 is Behind bottom of LH cowl panel (driver's side kick panel); Components Served (through Splices, etc.), Blower, Compass/Outside Temperature Module, Day/Night Mirror, Inside Cargo Lamp, Left Power Lumbar Compressor Motor, Outside Cargo/High Mount Stop Lamps, Right Power Lumbar Compressor Motor, Seat Belt Switch, Door Lock Actuator (PDL & Probably Power Window Motor);
G201 Location pic in a 92 Source: by BeastBronk at http://i69.photobucket.com/albums/i42/jprix82/GEDC0025.jpg
..
No - REPLACE heater blower motor switch.
=======
 

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Charlie don't surf..
'92 Ford Bronco XLT
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great info. Thanks again guys..I'm betting on it being the ground wire, but will start testing over the weekend.

To clarify, the ground that services the switch is behind the kick panel on the drivers side..

No, the "fan only works on high" description means all fan switch positions are dead, except high, which works as it should. That's invariably caused by the thermal fuse in the resistor burning open, leaving the only working circuit the one that bypasses the resistors & puts full power to the motor.

Your symptom is "all switch positions cause high fan speed", which suggests the fan switch has failed internally, or the wiring between it & the resistor is shorted. Unplug the resistor and test continuity from each pin to each other. With the switch in LOW, all should be open (infinite resistance). If not, pull the fan control out of the dash to inspect the switch & retest the wiring with both ends unplugged.
yo,
Check continuity of blower switch.
TEST PROCEDURE
Switch Position.....Continuity Between Terminals
Low...........B
Medium 1.....B + D
Medium 2....B + C + D
High..........B + A + C
Is switch continuous in all positions?
Yes - SERVICE Circuit 57 (BK) between switch and ground.
REPAIR as necessary. G201 is Behind bottom of LH cowl panel (driver's side kick panel); Components Served (through Splices, etc.), Blower, Compass/Outside Temperature Module, Day/Night Mirror, Inside Cargo Lamp, Left Power Lumbar Compressor Motor, Outside Cargo/High Mount Stop Lamps, Right Power Lumbar Compressor Motor, Seat Belt Switch, Door Lock Actuator (PDL & Probably Power Window Motor);
G201 Location pic in a 92 Source: by BeastBronk at http://i69.photobucket.com/albums/i42/jprix82/GEDC0025.jpg
..
No - REPLACE heater blower motor switch.
=======
 

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Yours should be very similar to this:



But a bad ground would cause NO blower operation - your symptom suggests one of the speed wires overheated & melted into the other wires, shorting them all to the full-speed wire.
 

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Charlie don't surf..
'92 Ford Bronco XLT
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ok, so the wire(s) I'm looking for run from the switch to the resistor, is that correct? Any idea where they come through the firewall?
 

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Would a "old and tired" resistor cause the fan speeds not to be as powerful as they were when new? Or do they either work/don't?? On a 1990 if it matters.

thanks
tim
 

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Charlie don't surf..
'92 Ford Bronco XLT
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15,783 Posts
Would a "old and tired" resistor cause the fan speeds not to be as powerful as they were when new? Or do they either work/don't?? On a 1990 if it matters.

thanks
tim
The resistor either works or doesn't, your symptoms probably indicate your fan motor is crapping out..
 
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