Help. The coolant overflown bottle om my T-Bird Keeps filling
up and the car starts to run hot. I beleive that the cooling fan
is not coming on at the proper heat range. What sensor should
I replace. The Engine Coolant Temperature sensor or the
Coolant temperature sending Unit. I beleive that the sending
unit controls the temperature guage on the dash but do not
know what signals the fan to come on. Any help would
Yes the fan runs. What is the PCM ? I have taken out the
thermostate and am running without it. So why would the
oveflow bottle fill up all the time. I still think that the fan
is not coming at the proper heat range. The radiator and
water pump are only 1 year old. So I don't know what the
problem is. The raditor cap is new as well. I thought that
the cap might not be the right pressure and letting the coolant
seep too soon. What is your thoughts.
The PCM is the Powertrain Control Module (main engine computer). It is
the fan is coming on at the wrong temperature. The ECT (Engine Coolant
sensor tells the PCM what the coolant temperature is. If it were out of range
to cause overheating (and excessive cooling system pressure) you would also have
severe drivability concerns. You didn't state the engine size but I'm starting
suspect it's a 3.8L.
Remove the radiator cap and top off the radiator. If you see bubbles with the
running the problem is most likely blown head gaskets. Look to see if you have
coming out of the radiator neck while it's running and check back.
If you run a koeo self test you'll know if the fans work or not because the fans
will either work or they wont. If there is a electrical problem with the fans
you will get codes. No codes go to the basics of cooling system diagnosis.
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