Question about 2001 Mercury Grand Marquis

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I have a 2001 mercury grand marquis ls. it overheats when im driving it but don't shows it on the temperature hand ..what is the problem ??

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Some say it could be a defective water coolant gauge. You might find some answers on the mercury forum where other car owners share same problems: https://mercuryforums.com/mercury-forum/forumdisplay.php?f=6

Posted on Apr 18, 2017

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The temperature switch on the side of the upper radiator hose is not working. That is, if the engine is hot. Boiling over - need to check thermostat. Grab on to upper hose (should be hot) than with engine off, grab bottom radiator hose. It also should be same temperature as top. If so, thermostat ok. Electric radiator fan - turn Ac on. Fans should run. No, check fuses & relay. Mechanical fan - with engine off, the blade should be stiff to turn. Easy, replace fan clutch. Usually, low level of water is most common. Wish you well.

Posted on Apr 18, 2017

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