Mechanics

REAR AC BLOWS HOT

1999 Chevrolet Tahoe • 192,000 miles

Front ac blow pretty cold the lines get cold except the one going to the rear system what would keep that line from getting cold
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Thurstn
June 19, 2012.



I need some info first with or without automatic A/C? Does the front a/c work normal all the time?

Racefan966
Jun 19, 2012.
It does not have auto ac and the front works normal for the most part it stays cold bbut the fan goes low an high on its own

Tiny
Thurstn
Jun 19, 2012.
Ok the fan might be the blow motor resistor going bad but we will get to that later. I will look over the diagram of the system and see what controls the rear temp and get back to you as soon as I can.

Racefan966
Jun 20, 2012.
Ok thank you very much for your time

Tiny
Thurstn
Jun 20, 2012.
Before we get to far I need to know if you are comfortable enough to remove the overhead console in order to run some tests on the controls to see if they are working? The temp control part is what I am most interested in checking. You will also need a digital ohm meter too. The other thing I would like to check is the mode door for the rear ac actually that is what I would like to check first as it is easier to get to. Let me know what you are comfortable with doing and I will walk you through it from there ok.

Racefan966
Jun 20, 2012.
Am very comfortable working on it just need a little direction

Tiny
Thurstn
Jun 20, 2012.
You have checked the 25 amp fuse for the rear ac? If not do that first and then I will look up the test for the blend door motor for the rear.

Racefan966
Jun 21, 2012.