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2001 f150 5.4 heater problem

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Old 01-02-2012, 01:17 PM
ogbobbyjohnson ogbobbyjohnson is offline
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2001 f150 5.4 heater problem

no heat out of truck.

intake heater core hose gets hot, out doesnt but flushed heater core so no restrictions with flow

replaced thermostat already

cant find heater control valve even though they sell one at parts store and internet has conflicting reports that it is replaced by the blend door



any help would be appreciated
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Old 01-02-2012, 06:52 PM
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steve(ill) steve(ill) is offline
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there is an electric motor under the radio above the transmission hump. It operates a small door inside the air duct that mixes outside air and heater core air to get the temp you want. First thing to do is pull the **** off the dash lever and see if the **** is tight on the shaft, or slipping. If it is turning, lay on the driver side floor and look up toward the radio. That is the motor. Take the plastic panel below the radio and above the hump off and look at what moves while you stroke the contnroll **** from hot to cold. Can be motor, small gear box, or cam level tied to the door.
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Old 01-08-2012, 11:37 AM
ogbobbyjohnson ogbobbyjohnson is offline
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i got lucky, after putting in the flush valve and using a water hose with more pressure, it seems to have cleared whatever was blocking heater core. thanks for the help.
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