why does my coolant temperature guage on 2000 grand marquis LS (digital) flash and alarm go off, even after I REPLACED SENSOR?

Asked by Nov 23, 2013 at 05:58 PM about the 2000 Mercury Grand Marquis LS

Question type: Maintenance & Repair

Guage(digital) started flashing and alarm beeps even with new sensor

3 Answers

122,525

Are you positive that it's not overheating? Have you recently done work on cooling system that you had to drain the coolant out? If so did you properly belch/burp the cooling system after you added the coolant back in?

122,525

If air in cooling system the alarms will continue to keep sounding off.

79,125

Wiring between the sensor and dash may be shorted to ground. This will give a false overheating signal. Follow the wires back from the sensor. Look for a damaged wire touching the engine. That would do it. HTH. -Jim

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