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Old 12-07-2010, 01:20 PM   #1
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99 Wrangler Sport Heater only works on low

Afternoon. My Wrangler's heater decided to crap out on me and now only works on low. After being told it was the resistor motor and changing that out I found out that was wrong. I have now been told I need to replace the whole switch panel which is about $300. I wanted to get some Jeep experts take on the situtaion. Did you have this problem? What fixed it? Id prefer not to spend $400 to have heat however that looks like what I might have to do. If the heater only works on low and low only, what do you think it is?

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Old 12-07-2010, 01:39 PM   #2
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Is it only the low speed, or low speeds? if its only the high fan position thats not working look for a blown fuse somewhere, either behind the glove box or under the hood. This happened to a friend of mine on a GMC... he was looking for something, I forget, and found a blown fuse, replaced it and his high blower started working again.

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Old 12-07-2010, 03:06 PM   #3
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In hoc brotha. Thanks for the reply.
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Old 12-07-2010, 03:57 PM   #4
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common issue. Saidly the fix is some relays and a new control box if the melting is too bad. Yep I said melting.

Pull the heater/ac control panel out and look at the back of it where the wire connector is connected on the far right side. It will have 3 wires. One which is a little larger and green. Check for melting. Look close. Also at the other connectors for any melting.

"""""to remove heater control box for inspection""""

Remove the defrost vent cover , pull up on the far side not the middle. pops right off.
Remove the ashtray. Open it and push down on the tab on the inside and slide out.
Remove the screw behind the ashtray.
At the top of the center bezel where you removed the defrost vent cover,,,remove the 2 screws that hold on the bezel. Pull the whole center bezel off..pull right off.
The heater/ac controls will have a few screws holding it on...take them off.
Poof your done. and can inspect the controls.

READ through this WHOLE thread. And the links in post #10.
CLICK ME---->>>>http://www.wranglerforum.com/f5/heat...rol-16174.html

If you have any more questions let us know.
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Old 12-07-2010, 04:08 PM   #5
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My symptoms were the same as yours, I replaced just the fan speed switch and it's been fine since. Easy to get to, kind of tricky to open (crack open) the cheap white plastic box that holds the switches, but start to finish it takes about 35 minutes.
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Old 12-07-2010, 04:49 PM   #6
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Crisp-
So yours only worked on low as well? How did you diagnose that the fan speed switch was the problem?

On a side note, it seems like the heater blows harder when I am driving vs. when I am sitting. Is this related to the problem as well?
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Old 12-07-2010, 04:52 PM   #7
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Check out the link In the above post I made. Also goes through inspecting the switch.
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Old 12-07-2010, 04:58 PM   #8
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Thank you distorted. Cross your fingers, not too good at thsi stuff. Ha.
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Old 12-07-2010, 05:17 PM   #9
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No worries it's not to difficult. If you need more help just let us know.
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Old 12-07-2010, 06:08 PM   #10
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I believe I checked it out with a volt meter and decided it was the switch. Typically when the heater resistor is out you don't get just the low setting. It wasn't a particularly expensive part. $27 or something like that. It's been awhile, it was the first thing I fixed when I bought it.
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Old 12-09-2010, 03:03 PM   #11
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Okay, took off the whole panel and everything was dirty yet unmelted. I mean without being able to test anything is there really anything to do besides replacing the whole control panel?
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Old 12-09-2010, 04:54 PM   #12
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UPDATE: So upon discovering that all of the wires weren't melted I wiped everything down back there. Wahlah. Now the heat works on low and high, not in-between, which is perfectly fine with me. No idea how I fixed it but I'm not complaining. Anyone need to hire a mechanic? I'm your man!
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Old 12-09-2010, 06:24 PM   #13
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As for the melting you'll need to look real close in the plugs and pins. If all is good. Clean the switch with electric cleaner. "you'll see how to from the link above". If it works after the cleaning of the switch...plan on replacing the switch soon.
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Old 12-09-2010, 06:48 PM   #14
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Old 12-10-2010, 01:07 AM   #15
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Quote:
Originally Posted by ajeepvirgin View Post
UPDATE: So upon discovering that all of the wires weren't melted I wiped everything down back there. Wahlah. Now the heat works on low and high, not in-between, which is perfectly fine with me. No idea how I fixed it but I'm not complaining. Anyone need to hire a mechanic? I'm your man!
Glad to hear you have it working again!
Mine was similar to this, I had low, med, and high, but not med-high.
About the time it got cold, it quit working all-together. I went to one dealership, and was told I'd have to buy the whole assy for ~$300.
I went to another dealership, and bought just the fan control switch, for about $20.
I think it depends on how they look up the part; the screen they were using at the second dealership looked different than the screen at the first dealership.
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Old 12-14-2010, 03:08 PM   #16
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Fan Switch

I had the same problem with my heat, only worked on low, and just replaced the fan switch, problem fixed. Went to local auto parts store Duralast part # SW2252 Price $26.99. I had to look real close at the five pins on the back of the switch, and noticed that one of them had a little bit of plastic melted around the base of the pin. When I cracked open the whole switch it was all jacked up/ burnt inside. Be aware when I cracked it open I ended up breaking the switch. Anyways, thanks for all the help.
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Old 12-16-2010, 08:08 AM   #17
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Thanks for the info I fixed my heater Tuesday. Heat is a must in MI.
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Old 12-16-2010, 08:37 AM   #18
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Originally Posted by ajeepvirgin View Post
In hoc brotha. Thanks for the reply.
No Problem. I'm a Jack of all trades, and a master of none.

And I was wondering if we had any Sigs on here.

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