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1992 Ford F-150 Heater only blows hot air when I drive

Tiny
CHRISSTO23
  • MEMBER
  • 1992 FORD F-150
  • V8
  • 4WD
  • MANUAL
  • 127,000 MILES
I recently replaced the blower motor and blower motor resistor in my F150 to get the heater working, but it still doesn't blow hot air until I actually start driving. I can let it idle for half an hour and it will still be blowing cold air, but once I start moving, it finally starts blowing hot air.
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Monday, February 4th, 2008 AT 9:52 AM

2 Replies

Tiny
INDYUKE
  • MECHANIC
  • 416 POSTS
What's the temperature of the actual engine coolant? That's what the heater uses to provide the hot air. Your thermostat may be stuck open.
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Tuesday, February 5th, 2008 AT 1:25 PM
Tiny
BRANDALL
  • MEMBER
  • 2 POSTS
You may want to check your coolant level. If it's low, the water pump can't push it into the heater core unless the engine is turning faster than an idle.
Good luck.
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Monday, March 17th, 2008 AT 6:05 PM

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