2004 Ford F-150 little heat

Tiny
FISHRICH28
  • MEMBER
  • 2004 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 36,000 MILES
My F150 has auto climate control, the fan works air moves through the ducts as I push the different buttons the engine runs at normal operating temps the thermostat has been changed. This is a Lariat model if that matters.I was told the heater core control valve was the problem but this model doesn't use one. Any help
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Monday, December 29th, 2008 AT 6:16 AM

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Tiny
BMRFIXIT
  • EXPERT
They use blend doors and actuators
check 1st the heater core hoses

Check heater core hoses if both are hot, if not the heater core need to be flushed as a 1st step
these are the steps
WARNING: NEVER REMOVE THE PRESSURE RELIEF CAP UNDER ANY CONDITIONS WHILE THE ENGINE IS OPERATING. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN DAMAGE TO THE COOLING SYSTEM OR ENGINE AND/OR PERSONAL INJURY. TO AVOID HAVING SCALDING HOT COOLANT OR STEAM BLOW OUT OF THE COOLING SYSTEM OR DEGAS BOTTLE, USE EXTREME CARE WHEN REMOVING THE PRESSURE RELIEF CAP FROM A HOT COOLING SYSTEM OR DEGAS BOTTLE. WAIT UNTIL THE ENGINE HAS COOLED, THEN WRAP A THICK CLOTH AROUND THE PRESSURE RELIEF CAP AND TURN IT SLOWLY UNTIL PRESSURE BEGINS TO RELEASE. STEP BACK WHILE THE PRESSURE IS RELEASED FROM THE COOLING SYSTEM. WHEN CERTAIN ALL PRESSURE HAS BEEN RELEASED, PRESS DOWN ON THE PRESSURE CAP (STILL WITH A CLOTH), TURN AND REMOVE PRESSURE RELIEF CAP.
Engine cool
lower the coolant level
Locate the two hoses running to the heater core
disconnect them at the engine side leaving hoses connected to heater core throw the firewall
use garden water hose and compressed air if possible
run the water and follow by air throw one side and out the other and vice versa
do that two to three times watching what leaving the heater core you are looking for the good flow and clear water to run throw
reconnect hoses
top off coolant system

if both hoses hot and at the same temp I would suspect the blend door actuator no good
good luck
let me know
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Monday, December 29th, 2008 AT 7:52 PM

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