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SOURCE: Heater problems on my 2000 Jeep Grand Cherokee. Please Help!!
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
SOURCE: 2002 jeep grand cherokee heater doesn't blow hot
If ythe heater core is not bad then I would replace the thermostat, this will stop the warm coolant running up to your engine go to the heater core.
SOURCE: heater/defrost doesnt blow hot heater hoses one
The heater core is probably clogged. The best method i have found is to remove the heater hoses, and blast compressed air into one side or the other in short bursts. This will tend to launch a clump of sludge out of the other side, and is very messy. Once the heater core is unclogged and reconnected, it is a good idea to chemically flush the entire cooling system, then flush with clean water and refill with universal coolant.
SOURCE: Just replaced Blend Door - Temp now Reversed!
never done one ?? but from what you describe you have fitted an actuator arm back to front
SOURCE: Blend door stuck on heater position and driver
I had this exact problem in a 2000 and it ended up being the air filter (engine compartment, pasenger side cowl)-all I did was replace it and both sides worked properly-you could try removing it and see if that solves it, if not I would think either the climate controller has a problem (vacuum line?) or maybe the blend door itself needs to be adjusted-hope this helps
Do you have enough coolant in the radiator, engine? Thermostat is workng good. Do the heater hoses get hot where they go into the passenger compartment? Or is it a blend door problem in the heater A/C plenum? If so, check out www.heatertreater.net for help. Easy repair if its a blend door peoblem. Use the hot steak knife , cuts easy when heated, to cut open the plenum to get at the broken doors inside. Good luck.
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