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Ask Jared D Your Own Question
Jared D
Jared D, ASE Certified Technician
Category: GMC
Satisfied Customers: 1598
Experience:  Shop Supervisor at County Fleet
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I have a 2004 GMC Envoy XL 4.2l. I turn on the heat and on

Customer Question

I have a 2004 GMC Envoy XL 4.2l. I turn on the heat and on full blast and it sounds like the heat is on full blast but nothing is coming out of the vents. Whats wrong?
Submitted: 1 year ago.
Category: GMC
Expert:  Jared D replied 1 year ago.

Does it change at all based on the mode setting? Defrost/vent/floor?

Customer: replied 1 year ago.
The floor and upper vents nothing. The defroster on top dash by windshield is blowing great!
Expert:  Jared D replied 1 year ago.

It sounds like the mode door actuator has gone out. It's job is to move a control door under the dash from one position to another based on where you want the air to blow out from. Do you want to replace it yourself? It's not very hard.

Expert:  Jared D replied 1 year ago.

Here is a diagram that shows how to replace it. It is under the dash on the driver's side.

Customer: replied 1 year ago.
Do you have a OEM part number?
Expert:  Jared D replied 1 year ago.

ACDelco 15-73596 or GM 89018675

Expert:  Jared D replied 1 year ago.

Please let me know if you need additional info.

Also, don't forget to rate. They don't pay us if we don't get a positive rating.