I went down to the track tonight, and on the way, the rear window started fogging up so I hit the defroster, It worked fine. After my first pass down the 1/4 mile, It started fogging up again, so I hit the defroster button, and nothing happened. The light never came on, and the window never defogged. Is it possible I blew a fuse while drag racing? It's dark out so I never checked tonight. But I don't see how it could be a fuse. Not sure if the defroster was on when I drag raced, I can't remember. Anyone have any idea?

 

Probable is just a fuse. The defroster turns off I believe after about 15-20 mins.

 

And it probably blew when you used it before and had nothing to do with the drag strip. That's just where you tried to use it next. As to why it blew... ? Who knows. If it continues to blow, worry about it then.

 

Believe it or not I've had nothing but troble with my rear defogger. I had to replace the whole glass, then a circuit board last year. Now I'm having the same problem. And it isn't the fuse. looks like it's time to take it to a GM certified mac.