Hi: My high speed on my heater switch does not work on my 1999 Bonneville . Has anyone had this problem? Low speeds seem to work fine. I believe this is probably simple problem, but I do not have any prints to go by. Thanks for any help: denkath
Assuming that you have the manual HVAC system your high speed problem could be a blown 30 amp high speed fuse located in the fuse block (left center fuse block looking rearward) on the firewall in the engine compartment or a failed high speed relay, also mounted on the center of the firewall in the engine compartment (should be the fourth relay from the left looking toward rear of vehicle).
A less likely cause could be the speed control switch on the dash.
Hi: Just wanted to thank you! The fan high speed relay was bad! Great job! It is great to know help is out there when you need it!!! Thanks: Dennis
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