Question about 2003 Ford Expedition

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2003 4.6L expedition overheating after 15-30 minutes driving city or interstate. coolant bubbling into overflow and mechanical radiator fan was turning while in overheat, no signs of coolant leakage from hoses, seep hole or into crank case or exhaust. after cool down fluid in overflow at back to normal level and vacuum present when overflow cap removed while running. where do I start? on older vehicle i would cool down remove radiator cap and start to wait for fluid movement not sure with this car.

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  • skydivemangu Jun 22, 2009

    changed the thermostat and same thing (overheat), the overheat is pegging the temp gauge which is what alerted my wife to point out the problem. after changing thermostat and running till overheat I checked the lower hose to make sure it wasn't collapsing and noticed a rather significant temp in upper hose to hot to touch and lower hose which could be comfortably held. still not sure how to determine it proper flow is present through radiator.

  • skydivemangu Jun 22, 2009

    water pump will be best economical try next with flush out which i have not tried, i was hoping that there was a way to determine coolant flow but i guess if it's not thermostat then pump/radiator/blockage is all that's left?

  • skydivemangu Jun 22, 2009

    thanks, i'll be sure and have the stat out when i flush, i don't have water pump or radiator in stock at local stores and wish i could know for sure what needs to be replaced in the interest of saving time and money. In my previous experience with water pumps they always leaked out of the seep hole when "bad" and this pump has no leakage.

  • Radio Code Pro
    Radio Code Pro May 11, 2010

    It can be normal for coolant to be returned into the overflow tank when the engine is hot. Is your temp gauge going off the dial to confirm that engine is actually overheating?

  • Anonymous Mar 24, 2014

    2005 Dodge Grand Caravan radiator needs to be refilled after most trips over say 30 minutes or so. No puddles under the vehicle. Used a pressure tester from Autozone and both the cap and system hold pressure as required. 1 thing I did notice with the cap off and engine running, the radiator fluid level will rise and fall, high enough to where I think the fluid is being forced in to the overflow tank. It is not overheating according to the gauge. This problem started after changing the radiator. I have removed the 2 lines that go to the rear heater / ac unit due to they had holes in them and I want to fix this prior to installing them again. Any ideas?



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  • 58 Answers

Change the thermostat

Posted on Jun 21, 2009

  • bkauffman1 Jun 22, 2009

    how about the water pump? did you try flushing the system? it could be clogged

  • bkauffman1 Jun 22, 2009

    when you reflush the system, it is best to have the therostat out so everything flows straight through.



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You have air in the top of the engine.
The antifreeze spewing out of the overflow happens due to your perfectly functional radiator cap
passing the overheated coolant/air mixture out of the system into the reservior (in an attempt
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