AC

1999 MERCURY MARQUIS
179,821 MILES • 4.5L • V6 • 2WD • AUTOMATIC
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LESLIEBROWN8
  • MEMBER
  • 1 POST
the air is blowing and when i idle the car it is warm air blowing then when i take off i will start having the AC get cold as i drive.
May 12, 2017 at 7:13 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
if system is full check belt and tension-er as recommended replacement is 60,000 for both. then check for blockage at condenser or fan not working with A/C on and finally check to see how full the system is.
May 12, 2017 at 8:51 AM
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STEVE W.
  • ✓Experienced Mechanic
  • 15,403 POSTS
Sounds like it has a blocked or damaged condenser. Or you have a weak compressor and the higher rpm makes it almost work correctly.
Test the system charge and watch the pressures as you increase the rpms. A low charge can act this way as well.
May 15, 2017 at 4:29 AM
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