Question about 2005 Ford F-150

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02 F150 4.6 I have no heat only cold air

The Rad is full, temp gauge indicated engine at proper operating temp, coolant looks clean, thermostat is new,

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  • glgruzd Dec 29, 2008

    Is there "easy" access to the blend door? With out taking apart the dash?

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Check the blend door near pass side behind glove box

Posted on Dec 27, 2008

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Confirm an operational thermostat and heat control valve.

Posted on Dec 27, 2008

  • Peter Fadoulakis
    Peter Fadoulakis Dec 29, 2008

    Unfortunately no. A good portion of the dash (all of it in some cases) must be taken apart to access the blend doors.

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Thermostat problems


your easy, that is caused by AIR Pocket in the engine block
the gauge can not read, air temps so if air is below the engine
coolant thermostat the ECT reads hot then air (cold ) repeats
you lost coolant and the number one reason for that is trusting
the silly side tank, (they fail easy)
never do that, on the next cold morning , dead cold
you take off the RAD cap. look down the neck, is it full of green
AF? id bet you its not.
the cab heater will never work with no engine heat, ever. so ......
never do the above on any hot engine.
also the thermostat might be bad and the coolant overheated
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the flush the system, and refill with 50% AF.
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the side bottle only works, (called the expansion tank)
if never overheated
and the tube in side is not dropped off
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LOW COOLANT LIGHT COMES ON SOMETIMES AND TEMP GUAGE SHOWS ENGINE GOING TO OVERHEAT. HEATER GETS COLD. IS IT THE THERMOSTAT?


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You need to fill the system up properly then look for leaks.
With cold engine, open radiator cap. Fill with antifreeze directly in radiator. Start engine, top up rad if level drops. Put heat control on Hot. Fan on low, heat on high. Gently rev engine and top up rad as needed. IF as engine heats up, it starts kicking fuild violently out of radiator, then the thermostat is bad. if not, then recap radiator, top up overflow bottle and you're done. Look under car for any sign of leaks. Steady dripping indicates a leak, then address that.

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i was going to say rad fan,but if so heater would be hot.
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water pump?
run engine with full coolant,at operating temp.with rad cap off and look in rad cap hole and see if there is movement of water inside rad.
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