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

Asked by 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

4 Answers


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,


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.


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?

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