Question about 2002 Chevrolet TrailBlazer

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Intermittent rear ac problem

2002 trailblazer ext the front ac works fine but the rear ac is real tricky ssometimes it will come on fine others i cant get the rear ac to blow any kind of air to the rear passengers at all?

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  • perandall Jun 29, 2009

    ok thanks. now where would that be?

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  • 109 Answers

Possibly a problem with rear expansion valve

Posted on Jun 28, 2009

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I have a 2004 chevy trail blazer ext 4 wheel drive does not work used it last week and was fine


When you switch from 2HI to 4HI, you should hear two distinctive sounds from under the truck, one is the transfer case actuator and the other is the front differential actuator. If you hear both and you still do not have power going to the front wheels, then there is a problem with the front disconnect assembly.

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2005 Trailblazer EXT. Blower speed control not working...


Problem with blower motor is the blower motor resistor. They are usually located next to the blower motor, a couple of screws and a couple of plugs and your done. Autozone sells them for around $30 each. Wipers you may want to check for relays under the hood in the fuse block. There may be 2 relays 1 for low and 1 for high. I have switched relays from other working accesories and got wipers to work. Sometimes bad connection.

Mar 19, 2010 | 2002 Chevrolet TrailBlazer

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Ac repair


Your Trail Blazer does not have a rear compressor. It will have a rear expansion valve and a rear evaporator core. Changing the line will depend on exactly where it is leaking. The lines run all the way from the front to the rear so it can be a chore. Do you know which line it is and about where it is leaking? There are a high and low side line, and they will have connections in places. With more info on the location I can look it up on the GM service site and give you more info. Good Luck

May 29, 2009 | 2003 Chevrolet Trailblazer Ext

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2002 chevy trailblazer LTZ - where do you fill rear washer fluid?


Uses 1 washer jar up front for both front and rear. Hope this helps

Apr 22, 2009 | 2002 Chevrolet TrailBlazer

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Rear AC does not turn on.


check the fuse for the rear fan.
also there is a rear control switch that moves control to the back switch
without the fan on,the a/c will not come on.
electronics can be difficult to fix without the circuit and the right test equipment.

Apr 03, 2009 | 2005 Chevrolet Trailblazer Ext

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