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Unread 11-08-2013, 06:00 PM   #1
Registered User
2000 WJ 
Join Date: Nov 2013
Location: Santa Barbara, CA
Posts: 1
Wj WJ HVAC issues

I have several problems with the HVAC system on my '99 Grand Cherokee. First off, all the doors (blend, recirc, defrost) make loud clicking and squeeking sounds when operating (I just replaced the blend and recirc doors and motors). Second, the blower motor is intermittent (Checked the plug and voltage is fine). Third, all the passenger side controls are opposite of what I set on the controller (The recirc door opens when the controller says its closed and vice-versa, and the passenger side gets hot when set to cold, and cold when set to hot. The driver side is fine). The only fault codes I get are for the blend and recirc doors over-travel.

In (hopefully) unrelated news, my radio randomly loses power at times (started after I got a car wash and they removed my antenna).


PeterB09 is offline   Reply With Quote Quick reply to this message
Unread 11-08-2013, 06:09 PM   #2
Registered User
1994 ZJ 
Join Date: Mar 2005
Location: Jefferson,GA, Georgia
Posts: 646
The intermittent blower may be the plug that's melted. The blower, as it ages, draws an increased amount of Amps. The plug them melts. There is a tsb for this. The harness cost me 19 at the dealership.

I'm not sure about the reverse bipolar behavior of the rest of the controllers. Did this start happening after you repaired the blend doors etc?
1994 Hunter Green ZJ 5.2L Quadratrac
228k Miles, 2" BB.
2002 Slate Grey Grand Cherokee Overland
161k Bone Stock
2008 Black JK Sahara Unlimited (Love it!)
porrsher is offline   Reply With Quote Quick reply to this message

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