Heating trouble shooting. - JeepForum.com
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post #1 of 5 Old 10-23-2013, 12:49 AM Thread Starter
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1994 YJ Wrangler 
Join Date: Jul 2010
Location: Farmington
Posts: 22
Heating trouble shooting.

Basically, I feel heat barely coming from my defrost vent, but its obviously not blowing. The fan speed control does nothing, no noise, blowing, just nothing. My guess is blower motor, but if anything, what else could cause this? It is in a 94 YJ. Thanks.

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post #2 of 5 Old 10-23-2013, 12:53 AM
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1992 XJ Cherokee 
Join Date: Oct 2012
Location: umatilla
Posts: 1,961
Check the relay for the a/c and blower. Check the fuses. I dint know where the blower us in s yj but you could pull the plug check for power.
If you have good relay and fuses and no power I would suspect the control panel .

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post #3 of 5 Old 10-28-2013, 09:07 PM
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1989 YJ Wrangler 
Join Date: Nov 2010
Location: Sin City
Posts: 2,881
Check the plug on the firewall below the batter tray single red w/white tracer. That is the blower motor hot wire it has a case ground.

The heater control panel I think 4 screws. Pull it away from the dash slowly. The lever that turns power on to the system uses two white wires check for voltage at both sides and then move the lever make sure power goes through. If you have power there on both sides go over to the passenger side and look at the heater vents you should find a plug going to the resistor that gives you the three speeds. Check for voltage there with a meter.

Here is apic of the blower motor wire and plug
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post #4 of 5 Old 11-08-2013, 05:12 PM Thread Starter
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1994 YJ Wrangler 
Join Date: Jul 2010
Location: Farmington
Posts: 22
Great, thanks fellas. Ill have to check it out this weekend. Hopefully its an easy fix. I dont really want to dig the blower motor out to swap it.
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post #5 of 5 Old 11-11-2013, 06:48 PM Thread Starter
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1994 YJ Wrangler 
Join Date: Jul 2010
Location: Farmington
Posts: 22
Well, we found that there must be a short somewhere. So, for now, we basically bypassed and I have heat. This is just temperary until I have the time to tear into thw dash to find the short. Thank fellas
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