Question about 2004 Chevrolet Suburban

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2004 suburban rear a/c only blows hot air

Rear ac only blows hot air through both roof and floor vents and whether it is set on automatic or manually controlled. when i first start it up, it will blow cold for a very brief time then go back to hot within a few minutes. there does not appear to be any problems with the dual air (driver's and passenger's sides) in the front. and it does not matter whether i have the setting for the rear controller or for the front controller active. 
the dealer says there are separate actuators for the heat and a/c. does that sound right? for some reason i just assumed that there was only one actuator for a blend door and that the blend door controlled the temperature???

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  • allthumbs367 Feb 01, 2009

    yep...i got that far, but was not one hundred percent sure and the actuator was 175 bucks at the dealer. is the process for calibrating it after installation difficult? does it require special tools??? if so, i'll just make an appointment and bite the bullet at the dealer. if it is simple, then i'll do it myself. i feel certain that i can take the panels off. i feel certain that i can replace the actuator itself, but the calibration???


    thanks

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Ase mechanic:
there are separate actuators for the blend doors. one for heat and one for cool. they work opposite and in conjuction with each other, if that makes any sense. ones open, ones close, for each different climate. sounds like the the cold one isn't opening in the rear.

Posted on Jan 29, 2009

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