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Old 11-08-2012, 07:42 AM   #1
BigJohn89
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Heater/ac stopped working!!!!

Just came out the other morning and its not blowing on heat or ac. Some air still comes through bc my window will defrost after 15 minutes or so. The backlight is still on and radio works fine but will not change and actually kick on the blower. I have not messed with anything and it just stopped working. Is there a fuse that could be bad? All help appreciated because my rear window is stuck down and taking the boys to durhamtown saturday. Thanks in advance

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Old 11-08-2012, 11:07 PM   #2
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Anyone have an idea where to start?

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Old 11-09-2012, 12:47 AM   #3
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Is there a fuse that could be bad?
Of course.
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Anyone have an idea where to start?
Fuse block.
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Old 11-09-2012, 12:48 AM   #4
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do you have power at the blower motor on the passenger side of the dash? yes? continue onto...

hit the motor with a hammer, does it turn over? yes? replace it. no? replace it anyway if you have power there.

the air is moving from you driving the vehicle or the head radiating from the core. if the fan isn't moving it's not the one moving air. start there.
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Old 11-09-2012, 07:32 AM   #5
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Of course.Fuse block.
None blown. Looks like my fb may have had a problem before





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do you have power at the blower motor on the passenger side of the dash? yes? continue onto...

hit the motor with a hammer, does it turn over? yes? replace it. no? replace it anyway if you have power there.

the air is moving from you driving the vehicle or the head radiating from the core. if the fan isn't moving it's not the one moving air. start there.
No air flow at all. Ill check the blower motor.


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Old 11-09-2012, 08:37 AM   #6
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yo BigJohn89 ,
I don't have the 89 Fuse Block Diagram but in 88, Fuse #9 is dedicated to Heater/AC - 30 amps
pic by jem270
&
pic in a 90

Source: by ElKabong (Ken, El Kabong)
Fuse #9 is dedicated to Heater/AC - 30 amps

Wiring Diagram in a 90
Source: by Seattle FSB (SeattleFSB) http://www.supermotors.net/registry/media/943188

Any air flow from Defroster Vents?
if so,
The 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.

Most common leak is in original white vacuum line to Outside Recirculate Door Vacuum Motor
pic in an 89 by Mavman
passenger side, near firewall and hood hinge; white vacuum line
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Old 11-09-2012, 11:39 AM   #7
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Looks like my fb may have had a problem before
In what way? It's common for the blower fuse to burn its terminals withOUT burning the fuse.

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Old 11-09-2012, 11:56 AM   #8
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In what way? It's common for the blower fuse to burn its terminals withOUT burning the fuse.
and to also burn the resistor and/or the connector for the blower motor.
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Old 11-09-2012, 12:48 PM   #9
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In what way? It's common for the blower fuse to burn its terminals withOUT burning the fuse.
Here is a pic. You can see where it burnt and the fuse was still in. All 30a fuses are still good that are in the fb.





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Old 11-09-2012, 12:51 PM   #10
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and to also burn the resistor and/or the connector for the blower motor.
Is this the motor you speak of? If so i hit it with a socket ext and nothing



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Old 11-10-2012, 12:09 AM   #11
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Here is a pic.
Yep - that's it. But that's not "a problem before" - that's your CURRENT problem. Click this, read the captions, and either replace the fuse block (the white plastic part), or move that fuse to another location:




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Is this the motor you speak of?
No, that's a vacuum motor for one of the diverter doors. He's talking about the BLOWER motor, under the L hood hinge.



But since you know the fuse terminal is burned, there's no point in worrying about the motor right now. I'm sure after you get the fuse fixed, the motor will work fine.
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Old 11-10-2012, 10:09 AM   #12
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Yep - that's it. But that's not "a problem before" - that's your CURRENT problem. Click this, read the captions, and either replace the fuse block (the white plastic part), or move that fuse to another location:




No, that's a vacuum motor for one of the diverter doors. He's talking about the BLOWER motor, under the L hood hinge.



But since you know the fuse terminal is burned, there's no point in worrying about the motor right now. I'm sure after you get the fuse fixed, the motor will work fine.
you mean under the passenger hood hinge. not left. not right...
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Old 11-18-2012, 05:32 PM   #13
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But since you know the fuse terminal is burned, there's no point in worrying about the motor right now. I'm sure after you get the fuse fixed, the motor will work fine.
Stupid question steve. Can you tell from the pic that the burnt spot is the correct fuse that controls the heater? Reason i ask is that this was the first time i have opened the fuse panel to see the block. Reason i ask is that i did not know if it was possible something else has been burnt out this whole time i have had the truck.


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Old 11-18-2012, 08:22 PM   #14
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...and you didn't look at the fuse block map on the knee bolster or in the owner's manual?
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Old 11-18-2012, 08:32 PM   #15
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My manual got torn up offroad by a cooler spill. And also no fuse map as that was the first place i looked. Then i looked online for a fuse diagram. It is indeed the correct fuse. It probably burned bc it was a 20a and it calla for a 30a. Changing the box should be easy enough right? How can i "move" the fuse location?

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Old 11-18-2012, 08:44 PM   #16
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Sry. Dbl post
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Old 11-18-2012, 09:37 PM   #17
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It probably burned bc it was a 20a and it calla for a 30a.
No, that would have blown the fuse - not burned the terminal in the fuse block.
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Changing the box should be easy enough right?
Let us know after you've done it.
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How can i "move" the fuse location?
Click that thumbnail and read the captions.
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Old 11-19-2012, 07:34 AM   #18
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Stupid question steve. Can you tell from the pic that the burnt spot is the correct fuse that controls the heater?
yo John,
That is Fuse 9 as shown in the Red fuse block diagram/legend pic by jem270 that I posted above

click on above to enlarge
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Old 11-19-2012, 04:48 PM   #19
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No, that would have blown the fuse - not burned the terminal in the fuse block.Let us know after you've done it. Click that thumbnail and read the captions.
i looked through and could not find about relocating the fuse. i saw where you put my picture in there also. I am def just goint to relocate the fuse as i had no idea what the back of the box looked like. More than I want to tackle. I only looked through the pics of my style fuse box. Again I appreciate your help steve
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