Question about 2008 Ford F 250 Super Duty 4WD

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Have a 2003 ford f150 crew cab truck will start to overheat and gauge will drop and heat will come out of vents for a few minutes and will go back to cold may do this several times or may only blow cold. Have had thermostat radiator cap and waterpump replaced had radiator and heater core flushed and antifreeze replaced and tested for pressure leaks still no fix any suggestions?

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  • tsuejackson Feb 20, 2009

    It is

  • tsuejackson Feb 20, 2009

    It is the triton

  • tsuejackson Feb 20, 2009

    It is the triton v8

  • tsuejackson Feb 20, 2009

    It is the triton v8 5.4

  • tsuejackson Feb 20, 2009

    It is the triton v8 5.4 liter

  • tsuejackson Feb 20, 2009

    Not sure how to post additional information but the truck has a triton v8 5.4 liter.

  • tsuejackson Feb 20, 2009

    just had the water pump replaced 2 days ago still doing it

  • tsuejackson Feb 20, 2009

    Had this done last week when they pressure tested to see if there where any leaks in the system

  • tsuejackson Feb 20, 2009

    could this be a control valve? Or senser problem?

  • Anonymous Mar 15, 2009

    2003 Ford F150 Lariat 5.4 Triton V8.  Losing water and hearing bubbling.  Heater works intermittantly- blows hot for awhile and then cold.  Radiator cap or hoses do not appear to be leaking. Sometimes shows hot in a very short distance but them dial will drop back down.Newly purchased so do not know history of the truck.  Would appreciate any ideas.  

  • Chuck Martin
    Chuck Martin May 11, 2010

    Which engine is this?


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  • Ford Master
  • 783 Answers

Problem is most likely the water pump.Have seen several of these doing this on the 5.4L. Impeller fins were damaged on the ones that I have seen.

Posted on Feb 20, 2009

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  • Chuck Martin
    Chuck Martin Feb 20, 2009

    Sorry I see you have already replaced the pump.

    It may be air in the system.Try raising the front of the vehicle up so that the top of the radiator is higher than the heater core then run it at 1500 rpm for a minute or so and see if u get bubbles from system then top it back off with coolant.

  • Chuck Martin
    Chuck Martin Feb 20, 2009

    No sounds like strictly a coolant flow problem. Something is stopping the coolant flow.It is either a restriction of some kind or a leak somewhere in the system that is either leaking the coolant or letting air into the system. The cold air out the vents is the key to this along with the overheating.There are no sensors that have any effect on coolant flow.

  • shannon whitlow
    shannon whitlow Mar 10, 2014

    so how do i figure out exactly where the restriction or leak would be?


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  • Contributor
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My Ford Expedition does all of the things you are describing. Try changing the heater core. Fords are notorius for plugged heater cores. Also, the previous owner may have dumped radiator stop leak in the coolant system, as was the case with my Expedition. Radiator stop leak should be banned. It only causes problems, plugging the tiny openings in the coolant system. Another thing to try is changing the temperature blend door, which may have failed. If you take it to the Ford dealer, they will probably quote you lots of money to fix it, but you can do it yourself with a little help from My Ford dealer couldn't even figure out the problem, he just used the old "it's a blown head gasket" cop-out. Good Luck.

Posted on Mar 17, 2009

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