This is generally cuased by a bad a/c control module. The module is the control unit for the a/c. GM has a technical bulletin for this exact problem as seen below.
Bulletin No.: 06-01-39-002C
Date: January 18, 2008
Replace the blower motor control module to fix the problem you are facing.
You can replace this piece yourself, it is under the dash on the passenger side. You may have to remove a plastic cover, then you will see it on the hvac housing next to the blower motor
The part is approx. $130, sorry I don't have the part number, as there are a couple of choices depending on your vehicle. You will have to give them your VIN number to get the correct part.
23 views
Usually answered in minutes!
do you have a pic
yes
×