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gauge temp sensor 200

what is the procedure for testing the gauge coolant sensor on a 91 240? The 700/900 FAQ mentions a link for measuring resistance, but I don't see any link, and regardless, the FAQ describes two terminals on the gauge sensor whereas my 240 has only one.

my temp gauge started to become erratic after changing coolant (9 times out of 10 needle shows no movement, but then suddenly it works fine). there appears to be steady voltage coming from the gauge.






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