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Bizarre Temp Gauge Situation- 200 1990

posted by  rice240 on  Thu Mar 26 11:50 CST 2020
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last visit: Tue Aug 26 10:51 CST 2014
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My temp gauge read really low for a while and then it read high, just below the red. Sometimes it would just drop suddenly. So I bypassed the temp compensating board. No change. I bought a new sensor, no change. I grounded the lead and it went high but not all of the way. IF I unplug it it goes down to cool but not to the bottom. I then grounded it to the negative battery terminal with a test light and the light came on very faint. I guess it is getting a signal from some electrical problem.

BTW I installed a TEMP gauge in the hose AFTER the thermostat so I can see that it is opening. car runs on that on at about 175.F. Where could it be picking up a signal when it's unplugged?

I give up! Help!






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