Question about 1993 Mercury Grand Marquis

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My 1993 Mercury Grand Marquis, thermostat while driving goes up and down, up mainly when sitting, and cools down when driving, what is the cause. Has a pin hole in hose near fire wall as well, not sure what this 8 to 10 inch hose is called.

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The hose must be a heater core hose. Change it & have your cooling system pressure tested. This will give you an idea if there are any other leaks in the system. You may have a head gasket leak & this test will determine your next step. Fill the rad or change the head gaskets or repair whatever leak there is. Hope this helps you. GOOD LUCK!

Posted on Mar 16, 2011

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Posted on Jan 02, 2017

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