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Unread 05-01-2013, 04:40 PM   #1
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Join Date: Sep 2011
Location: Fairfax, Va
Posts: 16
Heater/ac controls not working

I have a 1996 ZJ Limited, and now the heater controls don't function. The screen lights up, but the fan won't turn on or any of the controls. My buddy had a few minutes and checked the fan, and he said that fan works. He's thinking it's the controls or a fuse?

Any suggestions?

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Unread 05-03-2013, 09:37 AM   #2
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1994 ZJ 
Join Date: Aug 2011
Posts: 2,666
1. Fuse #7 (40amp) located in PDC under the hood supplies power to Blower Motor.

2. Check the connectors on the front of the heater box for pin damage from overheating.
There are usually visual "burny marks and meltyness" (author: ratmonkey)

Looks something like this...

Some cut the connectors out and splice all the wires together.
Or just bypass the connector with damaged wires spliced together.
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Unread 05-03-2013, 04:46 PM   #3
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1998 ZJ 
Join Date: Jul 2010
Location: florida
Posts: 6,291
I have often wondered when I see post like this if its the actual connector that is undersized in ampacity or other factors lead to this burnout. To me if the evap or heater core become clogged or even partially clogged would this not lead to a higher amp draw which with sustained use cook the connector? Even a filthy fan can significantly increase amp draw.
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