Question about 2003 GMC Envoy
This problem is caused by a defective blower motor speed control module aka blower motor resistor.
The blower motor resistor is right under the passenger side glove box, next to the blower. You need to unscrew two box screws to dismount the right hand insulation panel, then you will see the resistor pad - little bit inside up. Unscrew two box screws then the pad will come off, unplug the power from blower motor and the seven pin plug from resistor pad. Installation reverse way
Posted on Oct 29, 2012
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Posted on Jan 02, 2017
Yeah if you have to tap on it, then that means the brushes in the motor are worn out and you need to replace it. The blower motor is behind the PCM and Coolant Overflow bottle. If you remove these then it will give you better access to motor. You'll have to cut around housing. There should be a groove already there for you, just make sure you don't cut all the way around it. Once you open it and get the new one installed, you'll have to use caulk to seal where you cut it at.
Posted on Dec 20, 2009
Removal & Installation
Blower Motor Replacement (Delphi)
Blower Motor Replacement (Visteon)
Posted on Oct 02, 2009
There is a service bulletin for this problem which replaces the blower resistor and connector. Mine had the same problem while on vacation. No fan speed control, and when it did work, the fan would keep running after the vehicle was shut off. Mine is currently in the shop getting the service bulletin installed.
Posted on Jul 28, 2010
it has to do with your air ride suspension best bet is take it to the dealer there is probably a problem with a level sensor. hope this helps you
Posted on Mar 16, 2009
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