• Tiny
  • klewis37
  • 2004 Mercury Mountaineer
  • 6 CYL
  • 4WD
  • automatic
  • 92,000 miles

My heater is blowing cold air. It has antifreeze in it

Monday, February 21st, 2011 AT 6:56 PM

1 Answer

  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,410 posts

WIth the engine running, hot and the heater on, feel both heater core hoses. If both are hot, check the blend air door. If only one gets hot, flush the heater core. NOTE: The engine must be at operating temp for the heater to work properly.

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Friday, April 1st, 2011 AT 6:20 PM

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