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2001 Ford F-150 Heater blows warm then cold

Tiny
SCPRODUCTIONS11
  • MEMBER
  • 2001 FORD F-150
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 170 MILES
My heat in my truck blows warm for 10 seconds then goes cold but if I leave it on the floor it stays warm any other place does the warm to cold thing. I have flushed the entire system already
Saturday, November 1st, 2014 AT 11:56 AM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
Questions:

Is the coolant full?

With the engine running and warm and the heater on high, are both heater core hoses hot?

Let me know.
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Saturday, November 1st, 2014 AT 7:19 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
Questions:

Is the coolant full?

With the engine running and warm and the heater on high, are both heater core hoses hot?

Does the engine fully warm up to operating temp?

Let me know.
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Saturday, November 1st, 2014 AT 7:19 PM
Tiny
SCPRODUCTIONS11
  • MEMBER
  • 1 POST
Yes sir to all those questions
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Sunday, November 2nd, 2014 AT 6:18 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
If all those things are working correctly, then there is a problem with the blend air door. Most likely the actuator is going bad.
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Monday, November 3rd, 2014 AT 5:41 AM

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