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I just bought a 2002 Jeep Grand Cherokee Limited, and the heater just stopped working.. I tuurn the knobs for the heat to come on and no air blows whatsoever. what could have caused this, nad is it an expensive fix?
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You will have to check the flap operating controls behind the centre consol as anything could be wrong from a vacumn pipe to a operating mechanism ,even the computer controlling the climatic control .
Jeep Grand Cherokee is notorious for broken blend-air doors. This is the door inside the A/C-heater housing that switches the air from hot to cold. You must remove the dash to repair it.
I had this problem on a 99 grand cherokee limited, It was the heater blend doors and if you have dual climate control one side usually goes out before the other. These blend doors are located behind the glove box unaccessible inside the HVAC shell. (http://www.wjjeeps.com/hvac_sub_assembly.htm) Motor failures for this HVAC sub assemblies is also something to look for although much less common. My local dealership estimated $$$$$$$$$950.00 because they have to remove the entire dash so I looked around for something else. http://cgi.ebay.com/ebaymotors/Blen-Dor-Jeep-Grand-Cherokee-Blend-Door-Heater-Repair_W0QQcmdZViewItemQQhashZitem3eef1e1cd6QQitemZ270299700438QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
I used something similar to this and now have heat that is controlled solely by the knob nearest the driver. It wasn't very difficult just kind of a tight squeeze. Hope this helps GOOD LUCK
Thats your blend air door. . .I had the same thing with my 02 Grand Cherokee and I think ALOT of other people have as well. I took it to the dealer and ended up costing right around $800, because they have to pull the dash apart to get to the blend air door.
Air in the system or a clogged heater core. If it's air in the system, it needs to be burped. Click on my screenname, go down to Tips and Tricks, and follow the tip there on how to do so.
If the heater core is clogged, you'll need to blow it free. Follow the two heater core hoses from the firewall out to the engine. Disconnect them both, put one in a bucket, and use the blowgun attachment for an air compressor to blow into the other one. Then swap - put the one you blew into, in the bucket, and blow into the one that was in the bucket the first time. Reconnect the heater core hoses, and burp the system (again, follow the Tip instructions for that). Usually that will take care of it.
your heater core is leaking its not fog on your windows its from the antifreeze having same problem so im replacing it myself but having problems getting the dash off its a head ache the heater core costs 91.99 at autozone i priced the job at a few shops and it runs between 7 and 900 dollars.good luck man
generally this is caused by a "blend door " motor (actually a vacuum control) not working. I don't have a diagram on this but if you watch the motors mounted to the heater box under the dash, and operate the control, you likely will find one not moving (check all positions including a/c)
Mine did the same thing. The quick fix is to turn the knob to the
heat side, then push gently on the knob itself. You'll instantly
feel the air get warmer. The real fix entails taking the dash
apart.
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