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1999 Ford F-150 Heat takes a log time

Tiny
SAFDEMT
  • MEMBER
  • 1999 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 121,500 MILES
I have a 99 f-150 5.4lt. 4x4. When I start the truck and turn the heat on the truck gets up to temp. It takes about 1/2 an hour for the vents to start blowing warm air then it seems to work fine. Any idea why it would take so long? The anti freeze was flushed last year and is filled to the cold full range on the radiator.
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Sunday, November 22nd, 2009 AT 12:14 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Is the engine warming up in a normal amount of time? Also, when the engine is warm and you have no heat, with the engine running, heater on high (when no heat is coming out) are both heater core hoses hot?

LEt me know.
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Sunday, November 22nd, 2009 AT 2:56 PM
Tiny
SAFDEMT
  • MEMBER
  • 2 POSTS
Yes, Both the heater hoses are warm but not hot until the heat finally gets warm. The engine warms up in a normal amount of time
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Wednesday, November 25th, 2009 AT 9:05 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
I recommend first, try to flush the heater core itself. If that doesn't help, then my next recommendation is to have the blend door checked. THe blend door determines if you get AC or heat to the inside. If it is sticking or not working correctly, it may be stopping the heat from entering. It is located near the heater core itself.

Let me know what you find.

Joe
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Wednesday, November 25th, 2009 AT 9:30 PM

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