Question about 2005 Chevrolet Avalanche

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Air conditioner suddenly stops blowing cold and starts blowing heated air. Control panel indicates that it is still on air conditioner. Switching the control from vent to cold does not have any effect. Can turn off the ignition and turn it back on and the air starts blowing cold again. The freon is fine and the compressor works when it is blowing cold. Any ideas?

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  • meworkman Jul 06, 2012

    It appears that the issue was caused by the resistor unit rather than the blend door.

  • meworkman Jul 06, 2012

    In this case, it appears that the issue was caused by the resistor unit rather than the blend door.

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If you are absolutely confident the AC compressor is not kicking out on low pressure then it is the blend door actuator.

The blend door determines how much air blows through the heater core or evaporator.

The actuator can be purchased at dealer and maybe at a local part store.

Posted on May 27, 2010

  • meworkman May 27, 2010

    Thank you; however, the compressor kicks out once the unit decides to start blowing heated air.

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Sound like a vacuum operated device not working. under hood on passenger side is a vacuum operated lever that opens and shuts off the heater. sits close to the firewall sitting on top of the heater blower area in plain site. Usually brass mtetal looking with a tube attached to one side. that tube is the vacuum tube that makes the device pull on the lever. for testing puposes you can manually operate the lever and see if you have cold air again

Posted on Jul 04, 2012

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