MY HEATER IS BLOWING COLD AIR

  • Tiny
  • codyo32
  • 1999 Ford F-150
  • 177,000 miles

My heater is blowing cold air

Saturday, October 27th, 2012 AT 6:15 PM

5 Answers

  • Tiny
  • JDL
  • Expert
  • 16,236 posts

Do the heater hoses get hot? Does the engine reach normal operating temp? Another possibility is a directional door under the dash that isn't operating properly? I didn't check to see if you might have any hvac trouble codes.

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Saturday, October 27th, 2012 AT 6:18 PM
  • Tiny
  • codyo32
  • Member

Yes the hoses get hot and engine runs normal

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Saturday, October 27th, 2012 AT 6:22 PM
  • Tiny
  • codyo32
  • Member

I have drained my radiator and replaced my temp switch. Could I have to much water in my coolant still?

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Saturday, October 27th, 2012 AT 6:24 PM
  • Tiny
  • JDL
  • Expert
  • 16,236 posts

You need to check the temp door actuator. It is electric, there is a fuse for that. Check voltage and ground for temp door actuator.

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Saturday, October 27th, 2012 AT 6:32 PM
  • Tiny
  • JDL
  • Expert
  • 16,236 posts

Here part of diagram. See the #7 at the actuator, that is voltage, goes hot with key on, Check fuse 5-- 15amp. The black wire is ground. The other three wires are from the potentiometer/heater control.

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Saturday, October 27th, 2012 AT 6:41 PM

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