Question about 1992 Mercury Grand Marquis
If the Temperature gauge is moving less than before, its your Thermostat. If the Engine Temperature is the same, then your heat control valve is not opening or a duct flap(called a door) is not moving under the dash.
Having a Bad thermostat will affect how controls on the engine work and when they work.
Posted on Oct 08, 2010
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Posted on Jan 02, 2017
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