F150 5.4 triton heater blows cold and engine temp gague goes up

Asked by Note_1012 Feb 02, 2017 at 05:06 PM about the 2001 Ford F-150

Question type: Maintenance & Repair

We have a 2001 f150 5.4 triton with 115,000 miles
on it. Bought it about 9 months ago so we don't
know the history on it.  The heater will work fine
until about 5 minutes of driving it, suddenly the heat
starts blowing cool air and the engine temperature
gauge skyrockets. I pull the truck over and turn it
off, rest it for a minute or two, turn it back on and
the temperature is normal again and the heat is
working properly. Had it at a shop who ran all kinds
of block tests on it, it is definitely not a head gasket
problem. Replaced the thermostat and still have the
problem.

5 Answers

223,905

Sounds like the cooling system needs to be purged from air pockets, or the coolant is just low.

Pressure test was done overnight and found no problem. Have " burped" the system twice now,

223,905

And of course the radiator has ben checked I bet. Maybe you got a bad thermostat. You could take it out put it in a pan of water with a thermometer to see when it opens.

1 people found this helpful.
74,260

With the thermostat going through the roof at the same time the heaver stops blowing hot air would seem to indicate a possible blockage. Sounds like water is not circulating through the heater core at times, and at those times the temp rises. Sure the pump is OK?

2 people found this helpful.
10

I have a 2000 same issue exactly!! Flushed the radiator changed the thermostat replaced the water pump ran truck without radiator cap for an hour to purge air. But problem still there. Next step run it without thermostat I guess.

1 people found this helpful.

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