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1999 Mercury Grand Marquis Question: a/c blows hot air



eddiedez, Sacramento, CA, June 15, 2010, 21:42

a/c blows hot air. i found that diconnecting the climate control module for a few seconds sometimes makes everything work normally. i have to do this frequently and it doesnt always work. i want to fix it for good! please help.

4 Answers
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  • Answer #1

    June 16, 2010, 13:29

    Disconnecting things is not a good way to determine what is wrong, it doesn't give any real clues as to what might be bad. You'll need to see if the compressor is getting power when the A/C is not cooling, if it isn't then the electrical circuit to the compressor needs to be fault traced to find the problem.
    These systems are fairly complex so I advise taking it to a professional.

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  • Medium-star Best Answer
    Visitor, June 24, 2010, 22:16

    i have a ford tauras that does that sometimes try disconnecting the neg. battery cable for like 15 minutes then reconnecting. works for it

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  • Answer #3

    August 15, 2010, 02:48

    Your A/C needs recharging. An amateur can to it by themself by getting a recharging kit from a part store for like $30. If you take it to a mechanic, they'll charge you at least $100.

    But when you're A/C won't blow cold air anymore, it needs recharging.

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  • Answer #4

    September 04, 2014, 00:25

    This fix is great.

    Set air temp between 40 and 90 degrees.
    Turn off climate control with off button.

    Hit off and floor at the same time.

    It will enter into self test.

    You will see a spinning wheel on the display.

    let it go through the test.

    Good Luck,

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