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I'm not a mechanic so this is strictly a layman's diagnosis...my 97 Sunfire had the same problem develop a year or two back (thank GOD for mild winters in the northeast). I would turn on the rear defrost swtich on the dash...the light would come on...but no defrosting on the back window. I checked the fuse...it was fine. A friend had a circuit checker (I don't know the official name...bascially a metered voltage tester with negative and positive wires for checking the completion of the circuit.) I removed the connections at both sides of the window and checked with the tester...there was a connection between the two. I haven't narrowed it down farther than that. At least in my case it appears to be within the wiring itself and that can be anywhere from the back window back to the dash...and tracking that down would be difficult on your own and I suppose expensive at a shop.

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12y ago
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Q: Rear window defrost not working on 1998 sunfire?
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