tony1970 Posted October 20, 2020 Share Posted October 20, 2020 Hi all, my defroster will not shut off when the off button is hit on the controller same thing happens in the vent mode,bad controller? Link to comment Share on other sites More sharing options...
padgett Posted October 20, 2020 Share Posted October 20, 2020 Didn't GM have a problem with exhaust fumes and after always ran the vent when the motor was running ? Link to comment Share on other sites More sharing options...
tony1970 Posted October 20, 2020 Author Share Posted October 20, 2020 Gee I really do not know. Link to comment Share on other sites More sharing options...
DS_Porter 89 Burgandy Posted October 20, 2020 Share Posted October 20, 2020 I just had the same problem about a month ago. Turned out to be the fan control circuit board. Its mounted at top center of firewall with two screws and two connectors. Readily available from Rock Auto and others. Its a solid state device that you cannot test or repair. While you are in there look at the heat exchanger and remove any debris for better air flow. Link to comment Share on other sites More sharing options...
tony1970 Posted October 20, 2020 Author Share Posted October 20, 2020 Thank you for your feedback,i will look into that,thank you. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now