Question about 2003 Mercury Grand Marquis

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Replacement of the thermostat in my 2003 Mercury Grand Marquis

Thermostat doesn't warm the car up . Want can I do to replace it?

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Yes you can,drain coolant from the radiator,remove radiator hose,detach the thermostat cover from engine , remove the thermostat noting the direction in which it was installed in block. remove the gasket and thoroughly clean the sealing surface , refit the therostat.rifitting is the reverse of removal.

Posted on Jan 20, 2009

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Could very well be the sensor (thermostat). No idea where yours is located, but parts store location chart may help, or you could buy a shop manual.

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2003 grand marquis trouble code po 128. Heater works. 100 mile trips no problem. Temp gage below C. New sensor or new thermostat?


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I would replace the thermostat first and see what happens.

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1 Answer

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