Question about 1999 Jeep Grand Cherokee
Hi, Check the vents for clogs or broken vent tubes. Which are under the dash. Good luck
Posted on Oct 29, 2012
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Posted on Jan 02, 2017
Did you check your coolant level or was it low and you added to it at some point? If so the system my need to be bleed or worst case the thermostat is going bad.
Posted on Jan 03, 2009
THis is a know problem with Jeep GC. If only one side is cold and the other is hot and there are no controls error codes. It is likely a broken temperature blend door on the faulty side (w/ dual controls). Dealer charges a lot to fix ~$800. There is a kit and instructions sold on EBAY to replace the part for $100. Seller claims that a relative novice can fix w/o removing the entire dash board as the dealer does. Has sold hundreds of kits....people seem satisfied....you may check it out. Search Heater Blend Door Jeep on ebay. Replacement parts are aluminum instead of OEM plastic.
Self Diagnostics on HVAC system. Jeep GC has built in diagnostics and will return error codes on the temp display if it is otherwise. Simple to display.
1) Press A/C and Recir button simutaneously
2) Rotate driver temp control knob clockwise then release buttons
3) If no controls error a code of "0" or "00" will be returned.
4) Error codes listings can be found on-line if anything but zero
Dealers charge $45 to run the same check
Posted on Jan 21, 2009
Blend door for passenger side or blend door motor has failed. Very big job to remove dash and work on it. Except the door motor is accessable from the glove box.
Posted on Apr 29, 2009
SOURCE: PASSENGER SIDE HEAT NOT WORKING
The passenger blend door is broken on its shaft into the air cooling assembly.
The disgnostic is very easy, the part itself is very cheap. The bad new is that the dash has to be removed to reach the HCAV assembly where the blending doors are mounted. 15 hours labour time to replace it by an experienced technician. There is a kind of bypass solution developped and 'marketted' by a company. I have not install this fix by myself so far. Up to you to check if it could be interesting for you.
Hope it will help
Posted on Dec 31, 2009
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