why won't air come out of vents when a/c or heat is turned on

Asked by Aug 17, 2015 at 05:03 PM about the 2006 GMC Envoy SLE

Question type: Maintenance & Repair

2 Answers

104,085

There is some information on the Envoy forums about this kind of failure, usually it is the servo itself. You could have the codes checked and those codes will start with a Bxxxx

3 of 3 people found this helpful.

I changed the servo I got a code b3770

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