Question about 2002 Mercury Grand Marquis

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2002 Mercury Marquis Heat only comes out vents

After changing the battery only heat comes out. when the air cond. is turned on I can hear the compressor engage. I think the door? on the vent system is stuck. After hooking up the battery a thumping noise was heard behind the dash. How do I get behind the dash? Thanks for any help TK

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  • Mark0707 Mar 09, 2009

    I have the same problem with a 1996 Grand Marquis. Heard some clicking noises, then nothing but full heat would come out of the vent.

  • milestriano May 19, 2009

    I have a Grand Marquis 2002 and recently the air conditioner is not working properly. I don't know much about cars, especially ones with as many electronics systems as mine. I have read other blogs and one said if you changed your battery it is possible for a system in the car to burn out. I am not rich and wondered what could possibly be the problem so that when a mechanic does a diagnostic I don't seem completely ignorant. My car is a luxury edition and has climate control.

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There could be a thermal switch for blower speeds and temp. Since you needed to replace the battery, the thermal switch could have run down the battery. When you restored a dead battery with a fully charged battery a resistor blew. There is a cover underneath the glove box that can be removed and the glovebox lid can easily be unclipped to hang out of the way. Just look at the sides of the glovebox and you will see brackets which can be pinched to let the lid hang down. Unplug the switch and look for melted parts.

Posted on May 03, 2009

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