Question about 2002 Mercury Grand Marquis
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
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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Posted on Jan 02, 2017
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