Question about GMC Cars & Trucks
2004 GMC Envoy knocking or banging noise in the defrost part of the dash every time I start it Blower wil not switch from defrost to floor or to vents stays on defrost only
Sounds like the diverter door is bound up causing the motor to bog down under load. You'll need a manual for that job. It's a pain in the rear to get to.
Posted on Jan 30, 2018
Testimonial: "would a bad actuator cause this banging ?"
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Posted on Jan 02, 2017
Check for a vacum leak from the engine to the a/c.The color of the hose is black. Also check if the heater control valve hose is unplugged. If you have vacuum the it sounds like the door for the vent/floor/defrost is broken.
Posted on Jun 08, 2009
this is what is called a factory default. for safety purposes if there is a problem with the wiring in the climate control system it defaule to the defrost position so you can see out the window. this can be a pretty tough job, the whole dash may have to come off. unless you well versed in automotive diagnostics and troubleshooting, and have the right equipment, I would take it to a local automotive technician.
Posted on Jul 06, 2009
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