1999 MERCURY MARQUIS HEATER BLOWER PROBLEMS

  • Tiny
  • Sara Brooks
  • 1999 Mercury Marquis

Heater problem
1999 Mercury Marquis V8 Front Wheel Drive Automatic 120000 miles

Heater blows hot air when on cold airconditioning settings or when just vent is on during warm weather or whatever. Why isn't heater turning off and cold air or vent comming on when I use these settings? It is strange that during warm temperatures in the summer that the heater is comming on when I try to cool the car down or just use vent outside air. Help please!

Thank you!

Saturday, March 13th, 2010 AT 5:15 PM

1 Answer

  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,410 posts

Check the blend door. It determines if you get AC or heat and is located near the heater core.

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Wednesday, March 24th, 2010 AT 8:16 AM

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