Question about 2004 Mercury Grand Marquis

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2004 grand marquis where the a/c is only blowing on the defrost and floor at the same time. When you push just floor or panel it does not change it stays on defrost and floor. please help

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  • jruffryders0 Jul 20, 2010

    I checked the vac supply and it was good. I spent the whole day looking at this car. I am thinking it might be the EATC module

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  • 80 Answers

Either a vac. supply problem or a broken heater box

Posted on Jul 20, 2010

  • remymix Jul 22, 2010

    yes, it could be the eatc module....,yet, you may have to go to a ford dealership (hope not!) $$$ !

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