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Old 12-06-2013, 11:25 AM   #1
Michaelh325's Avatar
Join Date: Nov 2013
Posts: 16
Heater not working

I have a 1989 YJ. My A/C works perfectly but for some reason my heater will not work. I can't get the blower to switch to my defrosters or any other position. I'm pretty sure that it uses the same blower motor for both the A/C and the heater. Any suggestions?
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Old 12-06-2013, 12:00 PM   #2
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Location: Winchester, TN
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I'm sure yours is the add on A/C system similar to mine in my '87.The early A/C units were dealer installed and heater is a totally separate system with have different motors and controls.
The A/C blower motor is located on the left, under the dash near the steering column and sits vertical.
The heater blower motor is located on the right and is mounted through the firewall.
Check fuses and search for the forum for some great writeups on how the heater system works and how to troubleshoot it. Good luck.

If it ain't broke, don't fix it - Don't worry, something will break soon enough for you to fix!
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Old 12-06-2013, 12:01 PM   #3
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Location: Fishers, IN
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It does not use the same blower motor. The A/C is a separate unit with separate controls.

Are you using the A/C controls to try and get heat? The following is a pic of the AC controls. Do not use these.

You need to be using these:

Move the bottom lever over to Warm, you should see this gate move:

Next move the top lever to either defrost or "heat". The blower will come on. Use the verticle lever to turn the blower up more. If you are still having problems let us know what.

btw - "heat" is basically floor. We have vents for defrost and floor thats it for heat.
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Old 12-06-2013, 12:43 PM   #4
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Ok. The arm does move but nothing comes on when I use the I dash controls. Maybe it's a power problem
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Old 12-06-2013, 12:54 PM   #5
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Location: Ridgway, Pa.
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If its a power problem, its either a fuse, or the heater blower motor has come unplugged. It is located under the battery in the engine compartment.
'87 YJ, 4.2L built and bored, 8" of lift, 8.8 rear, AX15/NP 231J, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...
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Old 12-06-2013, 05:00 PM   #6
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Location: Willow Grove, Pa
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Same problem on my 87. Took the battery and tray out and saw the motor had a plug on the back with nothing in it. Found the wire I stared at all summer long and plugged it into the blower motor and BAM we got heat. If that's what you wanna call it. It is warm but like other poster said its floor and windshield vent only but it works now. Good luck
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Old 12-06-2013, 05:51 PM   #7
Join Date: Dec 2013
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Have 1995 jeep wrangle sometimes blower will come on but like once In a blue moon any one have any clues
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Old 12-06-2013, 07:57 PM   #8
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Location: Inland Empire, CA
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I have the opposite problem. My heater blows hot air whether it's turned on or not. I don't think I've ever even turned it on because I don't need to, lol. It's a nice feature in the winter, but not so great in the summer unless I have the top down.
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Old 12-08-2013, 05:11 PM   #9
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It was the plug under the battery pan. My heater is working great now. Thanks for the help.
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Old 01-01-2014, 05:30 PM   #10
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In my 94 I cannot seem to find any wires under the battery tray so what then?
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Old 01-04-2014, 04:17 PM   #11
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Join Date: May 2013
Location: Sucks
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mine comes on but it barley puts out any heat, and in summer it wont shut off all the way...
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Old 01-04-2014, 06:31 PM   #12
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Location: Central Calif
Posts: 528
there is a great sticky for the yj heating sys on forum

1990 4.2 MPFI, 1" body lift, 1" shackle lift
,2.5 suspension lift, 8000lbs winch,33x12.50x15
tuffy glove box vault,smittybilt locking consol,
4:10 gears,new steering column,S.S brake lines,
new sound bar,new head unit,new roll bar pads
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