Question about 2001 Mercury Grand Marquis

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No heat The blower works but it blows cold air. I changed the thermostat to no avail. The heater hoses and radiator hoses are hot. The door behind the glovebox is opening and closing when you switch from heat to a/c. The vacuum selector control under the dash near the gas pedal seems to be working properly also. I'm stumped.

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If the heater hoses are hot on both sides(indicating the engine is at full temp) and you feel the heat controller in dash is working properly, i would suggest disconnecting both heater hoses and backflush heater core with decent amount of pressure. if this improves condition but does not solve completely, heater core replacement is necessary.

Posted on Nov 16, 2008

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