Question about 2008 Ford F 250 Super Duty 4WD
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
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 heatertreater.net. 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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