Heater Control - JeepForum.com

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post #1 of 11 Old 11-25-2007, 09:52 AM Thread Starter
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1990 YJ Wrangler 
Join Date: Oct 2005
Location: Tucson
Posts: 171
Heater Control

90 YJ, 4.2l, No A/C

I have a problem with my heat control lever. When I to slide the lever from "cool" to "warm", the lever snaps back to about the halfway point. I cannot get the lever to slide to warm and stay there. I have traced it to the connection on the heater box, but cannot figure out how to adjust it to make it open the mechanism on the box. I usually just reach down there and open it by hand while holding the control lever in the "warm" position. Pain in the butt when I am driving. Any suggestions?

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post #2 of 11 Old 11-25-2007, 10:12 AM
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1993 YJ Wrangler 
Join Date: Sep 2007
Location: NH
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Iv got the same problem.... I just use my hand and push the control lever on the box all the way twoard driver side it opens the door and lets all the heat through.
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post #3 of 11 Old 11-25-2007, 10:37 AM
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1990 YJ Wrangler 
Join Date: Aug 2007
Location: CT
Posts: 43
It's probably binding up. Put a thin coat of 3 in 1 oil on all the linkages and work them back and forth.
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post #4 of 11 Old 11-25-2007, 11:27 AM
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1979 CJ7 
Join Date: Jun 2006
Location: Little River, SC
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Sounds to me like you just have a bad cable. Easy and cheap fix. Just replace it and be done with it. Most likely somewhere along the lines, the metal cable got a bend in it which won't allow it to travel properly. Even straightening out the bend never fixes it all the way. This is also a common problem on CJ's. Just my .02


Build Thread: 1979 CJ7 Blue Jeep
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post #5 of 11 Old 11-25-2007, 07:39 PM
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1990 YJ Wrangler 
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Location: Grass Valley California
Posts: 15,123
Mine was doing that when I first got it. I pulled the cable loose and then sprayed it with some lube, pulled the cable back and forth, sprayed it again. Haven't had any problems since then.

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post #6 of 11 Old 11-15-2010, 09:18 AM
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Greetings, I am trying to help a friend fix the heat in her 1989 TJ. The temperature slider moves the pivot arm on the heater box but the other end of the pivot arm is not connected to the the metal arm that apparently controls the air mix flap inside the heater assembly. I found a picture of the proper assembly orientation and I can adjust to make that work but my other concern is that the mixer flap seems to move only about 1-1.5 inches total back and forth...Is this correct? If not how do I get in there to free up the movement to have complete temperature control. This Jeep does not have AC by the way...


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post #7 of 11 Old 11-17-2010, 07:36 PM
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1990 YJ Wrangler 
Join Date: Aug 2010
Location: Maine
Posts: 383
My cable is broken at the heater console. Dealer item only?
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post #8 of 11 Old 11-18-2010, 03:45 AM
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1995 YJ Wrangler 
Join Date: Oct 2010
Location: Morristown
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I had all the same issues on my new used jeep. When you remove the control you may find that over time the ends are kinked due to lack of lubrication in the line. I also found one end completely snapped off the plastic retainer. After following the advice here of lubricating the lines, ends and door hinges I also had to drill a small hole directly through the center of the old plastic retainer. Then used a small screw and created my own thread to have it hold the cable to the vent control side. So far its all 100%. A new cable would be great but I always like to see if I can fix it for free 1st...
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post #9 of 11 Old 11-18-2010, 06:12 AM
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So can either of you tell me what the travel should be on this little thing, or at least what yours is???
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post #10 of 11 Old 01-26-2011, 12:48 PM
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1984 CJ7 
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Location: henderson
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blower motor resister

my 87 yj blower has only one speed, i think its the resister,anybody know where to get the replacement?
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post #11 of 11 Old 01-26-2011, 01:12 PM
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1989 YJ Wrangler 
Join Date: Apr 2008
Location: Detroit
Posts: 22,482
Hey Tommy you should creat a new thread. You can get the heater block at any auto parts store.
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