C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Rear window defogger relay?

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Old Aug 28, 2001 | 04:56 PM
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russell1755's Avatar
russell1755
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From: ky
Default Rear window defogger relay?

I cannot get current to my rear window defogger. The fuse and circurt breakers check ok, but I read something about a relay. Does anyone know where this would be?

91 coupe red (all stock) :confused:
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Old Aug 28, 2001 | 06:28 PM
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weekendwrench's Avatar
weekendwrench
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From: SF Bay area, CA USA
Default Re: Rear window defogger relay? (russell1755)

On my 87 the manual says it is behind the heater and AC control assembly. Sounds like it may be attached to the assembly.
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Old Aug 28, 2001 | 07:20 PM
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From: Woodstock GA
Default Re: Rear window defogger relay? (weekendwrench)

Were are you checking for power? check down at the bottom of the rear hatch lift piston jump a test light from one side to the other. The lift pistons can loose continuity through them some times especialy if the ends loosen up. Also there is a 25 amp A/C fuse that powers the relay that needs to be checked. In most cases I have fount a poor connection at either end of the lift piston or a end loosening up or a broken wire on the rear glass. The relay is above the right side hush panel under the dash.

David Fulcher
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