I have an 02 Grand Prix GT. I've had a couple of issues for a while now that I believe are somehow connected, but possibly not.

When I start the car my daytime lights and a/c fan sometimes come on and other times it can take up to 30 minutes before they work. The reason I believe it is the same issue is because they both work or don't work at the same time.

Could it be an issue with the wiring harness? My previous mechanic said no and charged me alot of money to fix individual problems that really didn't fix anything.

Any suggestions on where to start would be greatly appreciated.