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Replaced heater control on 2000 Pontiac sunfire. rear window defroster still inop.?
Wiki User
∙ 15y ago
Those danged rear window defrosters are wonderful when they work. They are pretty fragile and if just one of the little wires in the glass becomes damaged, you're done.
Try opening the trunk and if you have to, climb inside. There has to be an electrical connection in there which goes to the defroster grid. It might have come loose. Or, it might have dirty contacts. Shoot it with a little contact cleaner or WD-40 and try it again.
If you can indeed get at that connection in the trunk, try turning on the defroster switch and check for voltage at the connectors with a voltmeter. If you have voltage there but the defroster still doesn't work, it points to a problem in the glass. If you have NO voltage there, it would point toward the cabin and the defroster switch or the wiring from the cabin to the trunk.
Wiki User
∙ 15y ago
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