1999 Ford F-150 DEFROSTER AND HEATER ONLY THROWS COLD AIR

Tiny
LIFEGUARD
  • MEMBER
  • 1999 FORD F-150
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 14,700 MILES
I WAS TOLD TO CHECK TO SEE IF THE HEATER CORE VALVE IS STUCK BUT I WAS INABLE TO LOCATE IT. HELP
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Tuesday, November 2nd, 2010 AT 8:55 AM

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Tiny
WRENCHTECH
  • EXPERT
There is no such component.

With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch. If they are.

The temperature is controlled by the use of an air mix door that is operated by an electric motor/actuator. This door can be jammed or the actuator can be inoperative or have stripped plastic gears internally.
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Tuesday, November 2nd, 2010 AT 9:43 AM

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