MY HEATER WORKS BUT ON BLOWS OUT AT A LOW ...

  • Tiny
  • carlosfernandez
  • 1998 Mercury Mountaineer
  • 160,000 miles

My heater works but on blows out at a low setting weather in set it to high or low but my rear one works just fine

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Wednesday, October 17th, 2012 AT 1:07 PM

9 Replies

  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

Can you please rephrase your question?

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Wednesday, October 17th, 2012 AT 1:27 PM
  • Tiny
  • carlosfernandez
  • Member

When I turn on the heater it blows out as if it is on the lows setting when I turn it up it still blows out low. My rear unit blows out high and low.

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Wednesday, October 17th, 2012 AT 1:35 PM
  • Tiny
  • carlosfernandez
  • Member

While I drive the faster I go it seems to blow out a little faster but really no change. I can only feel it when I put my hands on the vent.

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Wednesday, October 17th, 2012 AT 1:39 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

The air flow is low. If the blower motor noise changes when setting is increased it means air restriction in the air flow circuit. Check the cabin filter if equipped.

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Wednesday, October 17th, 2012 AT 1:50 PM
  • Tiny
  • carlosfernandez
  • Member

I will check now and see if that is the problem thanks for the response

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Wednesday, October 17th, 2012 AT 2:11 PM
  • Tiny
  • carlosfernandez
  • Member

No cabin air filter. The noise cant tell any different

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Wednesday, October 17th, 2012 AT 2:29 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

Since the blower fan motor is not responding to the control, it could be a failing fan motor, a fault with the blower motor switch controller.

Is your HVAC system manual or automatic?

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Wednesday, October 17th, 2012 AT 8:26 PM
  • Tiny
  • carlosfernandez
  • Member

Not sure, I tested my power to the blower and it is getting power if that helps.

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Thursday, October 18th, 2012 AT 4:24 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

Automatic means the control panel has a function for Auto.

Seems the notification has a problem and I am not being nootified of any replies.

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Thursday, October 18th, 2012 AT 7:05 PM

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