Question about 2000 Mercury Grand Marquis
Make sure that your thermostat is working correctly. Let the engine warn up, not long enough for the vehicle to get into close loop, but to where the hose is warm. At this point the hose should be hard. If it isn't hard you will also hear the water flowing as you squeeze it. Often the thermostat goes into a fail safe mode which is all the way open and with the engine having run hot, this could have caused failure here. If it does't pass this test, it should be taken out and looked at. If it is bad you will see it all the way open...you can always compare it with the new one.
Posted on Mar 28, 2011
Check if you have correct temp sensor. Computer is 2 wires, in German cars you see 4 wire applications.
Very important to inspect harness connector and pins for damage or corrosion. Sensor gives a resitance value to ecm for signal. Loose and corroded connectors will cause false readings.
Don't forget basics. Water flow, and thermostat operation.
And quite possible the parts department sold you a faulty one . Like that never happens.
To test sensor attach ohm meter and you should see a rise or fall of resistance reading with changing temperature. SiMply have a bowl of hot and cold water, dip Sensor back and forth in hot and cold water to see resistance change.
Posted on May 18, 2012
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Posted on Jan 02, 2017
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