95 caprice 9c1. temp gauge only reads when the car is shut off. Doesn't read when car is running. What can it be?
Nov 22, 2010 at 8:04 AM
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KHLOW2008
CAR REPAIR CONTRIBUTOR
41,814 POSTS
Either there is a bad ground somewhere resulting in currect backflowing to gauge or the meter cluster is bad.
Unplug the temperature sending unit wire and if the meter drops, check for bad grounding circuits between engine and body.