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Coolant System Diagnosis 140-160 1972

posted by  planetman on  Fri Dec 4 23:42 CST 2020
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last visit: Fri Oct 24 09:29 CST 2014
[RELATED]

Did you overlook the fact that the water temperature sensor needs to be grounded for the gauge to operate properly?

I believe you aren't reading the wiring diagram correctly. The wire from the water temperature sensor is connected only to the water temperature gauge via the PC board on the back of the cluster.

However, the output wire from the voltage stabilizer does go to both gauges also via the PC board.

On more than 1 occasion, erratic or non-functioning pre-1973 140/164 water temperature and/or fuel gauges has been caused by loose mounting nuts and/or corrosion between the mounting nuts, washers and PC board.









--
Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90502
hiperformanceautoservice.com or oldvolvosonly.com






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