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It may be a blown fuse. If you have kids, maybe one of them unplugged it for you. Look at the rear window. You can see where it plugs in from the inside.

AnswerI had the same problem and discoved that there is a module where the FM entenna (it's in the rear window) and the defrost are plugged together. This module was the problem.
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โˆ™ 2011-09-13 17:24:12
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Q: Why would the rear defrost in a 1999 Oldsmobile Alero just stop working?
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