Rear AC blows hot

THURSTN

MEMBER
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

Tuesday, June 19th, 2012 AT 8:31 PM

7 Replies

RACEFAN966

MECHANIC
5,029 POSTS

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

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Tuesday, June 19th, 2012 AT 10:00 PM

THURSTN

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4 POSTS

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

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Tuesday, June 19th, 2012 AT 10:34 PM

RACEFAN966

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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.

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Wednesday, June 20th, 2012 AT 12:49 AM

THURSTN

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Ok thank you very much for your time

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Wednesday, June 20th, 2012 AT 10:07 AM

RACEFAN966

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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.