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12th October 2018 at 10:04
#637
This seems to be a more common problem than at first thought?
I dont know how these sensors work (the old thermostats used to use wax?) but I suspect maybe a bi-metal strip? Perhaps a couple of taps with the handle of a screwdriver on the body of the sensor might free-up whatever’s stuck and produce a good result? Judiciously done, it shouldn’t do any harm and it’s worth a try. When the engine’s cold, turn on the ignition, tap the sensor body then see if the gauge drops.
Barry