Question about 2004 GMC Envoy

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2004 chevy avalanche with dual control system problem

Any idea why a 2004 chevy avalanche with dual climate control setting at 60 with a/c on would blow hot on passengers side and cold on drivers side?? Pulled the fuses and they are in good shape, anything else I should look for or test?

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  • Andy Smith Sep 30, 2013

    This happened to me and turned out it was a low car battery. If the voltage is too low it can't activate the actuator. Got a new battery and presto cold air on both sides.

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This problem is caused in almost all cases by a failed actuator that moves the door insiode the heating/ac duct to change the outlet temperature, it is called the Air Temperature Control Blend Door actuator.

Posted on Oct 05, 2009

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Likely your passenger side blend door actuator not switching.

Posted on Nov 14, 2012

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