SOURCE: 2003 olds alero rear windoe defogger
the rear passager panel the one that cover the side rear window there a relay connector in there that were the power to window go that defectif that gonna FIXYA our post thank you pierre
SOURCE: rear window defogger stopped working
More than likely something has scratched the film that heats up to do the defrosting, Look to make sure it has both wires attached, and use either a test light (make one out of a 12volt bulb and wire if you do not have one.) See if you have electricity to the wires at the ends. If you do, you have a break in the film. You should be able to see where it is broken or scratched. There is an after market repair kit for this, that is not really expensive.
SOURCE: 2002 Alero defogger
A common thing to fial on these- assumning the grid is ok, and wires are still attched to grid, is the rear def / antenna module. It is behind rt. rear quarter trim panel. The modules burn up, and also melt the connector. the module and connector would need to be replaced.
Heater core is bad. Part is about $40...labor is around $700. The entire dashboard has to be removed and this is a major time involved job. It takes 10 to 12 hours.
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