THE HEATER BLOWS COLD AIR.

  • Tiny
  • meswa
  • 2006 Mercury Marquis
  • 26,000 miles

I have a 2006 Mercury Grand Marquis. Coolant level is OK. I replaced the thermostat, no change. HELP ! Also the door under the dash opens and closes turning heat on and off.

Monday, October 10th, 2011 AT 5:04 PM

8 Answers

  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,287 posts

The door you hear is the blend air door. It is what determines the temp that enters the vehicle. Check the actuator on the door. If it is moving around, you will get heat and then outside air (cool).

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Monday, October 10th, 2011 AT 5:06 PM
  • Tiny
  • meswa
  • Member

I watched the door open and close.
I still don't get heat, only cold air?

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Monday, October 10th, 2011 AT 5:32 PM
  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,287 posts

Okay, I need you to check something. I thought the door was working on and off. With the engine hot, the heater on high, feel both heater core hoses at the fire wall. Are both hot?

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Monday, October 10th, 2011 AT 5:36 PM
  • Tiny
  • meswa
  • Member

Yes

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Monday, October 10th, 2011 AT 5:40 PM
  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,287 posts

If the hoses are both hot, then something has to be heppening with the blend door not staying positioned correctly.

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Monday, October 10th, 2011 AT 5:46 PM
  • Tiny
  • meswa
  • Member

Is there more than one door?
The one inside that is in front of the blower motor opens and closes switching from air to heat.

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Monday, October 10th, 2011 AT 5:50 PM
  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,287 posts

No, that is it. I tried to find a picture. The best I could find was of the actuator. Take a look and let me know if it looks the same as what you are seeing.

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Monday, October 10th, 2011 AT 5:58 PM
  • Tiny
  • meswa
  • Member

No. The door is vertical. Opens with Air cond and closes when I move the switch to heat.

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Monday, October 10th, 2011 AT 6:03 PM

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