Question about 2004 Chevrolet Suburban

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Rear AC blows heat only (1997 suburban)

Changed compressor, vac system, charged system, removed back pannels looks like the actuators are working,supply lines under truck not getting cold What next???

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  • Bob Bisciotti May 11, 2010

    Are the rear lines that your're feeling before or after the orifice tube (expansion valve)?

    Did you recharge with correct pounds of R134A? (dual system)

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  • 37 Answers

Is the fount working good? you may have a blocked line or the regulatory on the rear evaporator is not working

Posted on Jun 23, 2009

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Instructions replace blend door actuator 2003 chevrolet suburban


You would have to take the rear trim quarter panel off to get at it . If you are taking about rear Heat - A/C . It's not under the dash ! Aux heat A/C has it's own unit in the back of the vehicle . 2003 Tahoe No Rear Heat Fix Suburban Yukon XL Repair This is to show where it is located , not to fix a no heat problem . How to get to the
Auxiliary Air Temperature Actuator
The auxiliary air temperature actuator is a 3-wire bi-directional electric motor. Ignition 3 voltage, ground and control circuits enable the actuator to operate. The control circuit uses a 0-12 volt linear-ramped signal to command the actuator movement. The 0 and 12-volt control values represent the opposite limits of the actuator range of motion. The values in between 0 and 12 volts correspond to the positions between the limits.
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1 Answer

2004 suburban rear a/c only blows hot air


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.

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