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.

Goodluck.

Posted on Dec 12, 2008

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sounds like your fan is either jamned, burnt out or even frozen, you might be lucky and find its just a blown fuse, you'll need to check your fuses box then start investigating if the fan turns freely or not

if you put the air on recirc you might be able to stop cold air blowing in when you are travelling. if you are waiting for a garage to sort out the fault then get a fan powered by the cigarette lighter, air moving over the window should at least keep mist clear even if it doesnt defrost it

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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.


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The defrost has leaves in heater box , blocking air flow on pasenger side most likely???? Check it out.

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Defroster


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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