Question about 2002 Jeep Grand Cherokee

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Defrost doesn't work

I have an 02 grand cherokee. I start the car in the morning, turn defrost on, but it doesnt do anything. I have to drive for about 1/2 an hour before it starts blowing. Its the same with the heat and AC. the longer I drive, the better it works. It seems to me that the harder I push the gas, the warmer it blows. any suggestions?

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  • yadayada
    yadayada May 11, 2010

    the blower doesn't work?



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If your ac blows hard and cold then it could be your heater core, but most likely the thermostat is going bad. When those fail it leaves the radiator in an open position and all your coolant goes through your radiator, so when its cold out its hard to get warm air out of your heater. IF it were my jeep i would take it somewhere and have the radiator and heater core flushed and check the thermostat. IT can be done yourself but requires some flushing agent from auto zone or auto parts store and some time and auto knowledge.


Posted on Dec 12, 2008


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My 2000 Grand cherokee only blows warm air from defrost or any vent, 105 to 110 on a 32 degree morning with high fan, about 10 degrees warmer on low fan. It gets warmer when it warms up outside.Engine...

This is a common problem with WJ Grand Cherokees, it's called a "Blend Door".

In the heating and cooling system you have doors that open and close to give you warm and cold air and a mix of both.

What you have is an arm that pulls a door with peg on top, the peg tends to snap off. As you said your dealer replaced the blend door or doors I would take it back as is has blend door all over it.

Yahoo and youtube "jeep grand cherokee blend door repair"

I had a 02 limited blend doors issues (note the issueS) and was lucky to have it still covered.

I do hope this helped.


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Heater control stuckon defrost.The knob still works tho. You can turn it but it stays on defrost.

I had the same problem. I found a bad vacuum hose under the hood. I replaced it and everything was fine. This also effected my cruise control. The solution is really simple and didn't cost me anything. Car dealer wanted $649.00 to replace a blend air door, which involves taking out the dash. So check fuses and vacuum lines first. Worked for me.
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The cooling system is fine along with the heater core. I finally took it to shop and the actuator that controls the regulator was inoperable. Instead of opening correctly it was just spining around completely without stopping. I have ordered parts and will have to take out the dash to replace the items.

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