Question about 1999 Mercury Grand Marquis

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I have a 99 grand marquis ac turns on but theirs no air blowing

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The blower motor is possibly bad.

Posted on Jul 11, 2010

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Posted on Jan 02, 2017

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1 Answer

Why won't my Mercury Grand Marquis's AC blow cold air? We asked them to replace the old Refrigerant, but instead they put in anew EATC, Alternator, Fan, and Battery.


faulty install take it back
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O ring or pipe connection not tight enough
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I have a 99 grand marquis the a/c still blows could but it only blows hot air how do I fix this problem


If the blower works but no cold air, a mechanic would check to see if the system is low on freon, then check for voltage at the low pressure switch and the ac clutch as needed.

Aug 19, 2012 | 1999 Mercury Grand Marquis

1 Answer

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The first question is do you know if the ac compressor is running ?
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1 Answer

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check the doors in the heater ductin and make sure all the door motors r workin properly

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2 Answers

2000 Mercury Grand Marquis will only blow hot air when ac is on. The ac system does work lines get cold but will not blow nothing but hot air. Has automatic climate control system. Will direct air from...


needs re-gassing because one line should be hot (feed) and the return cold , This is a specialist job do not attempt to do it yourself because its extremely dangerous with very high pressures involved

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1 Answer

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removal of the dash is the easiest way of reparing the ac system other than the under hood parts

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