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1998 Mercury Marquis, V8, 118,000 miles heat gauge does not show engine to be running warm.


If the temp gauge works at

If the temp gauge works at all and it's not getting warm, replace the thermostat and check the (CHT) This vehicle is equipped with a Cylinder Head Temperature (CHT) sensor as noted, which screws into the cylinder head and measures head temperature. And the 2-wire coolant sensor in the crossover is for the temperature gauge but there is NO ECT sensor on this engine. Aftermarket scan tools generally show a declaration message that states "not all PIDs supported". The ECT sensor is "not supported" on this vehicle.

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