About a month ago my daughters 2003 Civic reached 100K miles and we had
pur family's long trusted mechanic do the 100K timing belt, spark plugs
and water pump replacement.
A couple of weeks later the car's temp gage rapidly soared up during
city driving. Not wishing to take any chances, daughter called AAA and
had her Civic towed back to the mechanic who'd done the 100K maintenance.
Our mechanic test drove it and told me that he couldn't get it to
overheat. There was plenty of coolent in the system and while we
discussed it on the phone I suggested that maybe the thermostat was
flakey and asked him to replace it. He did that.
The car didn't overheat again for about 8 days, but while on a road trip
the temp gage soared up while on the highway. She limped the car to a
repair shop where the mechanic there diagnosed it as a failed cooling
fan temperature sensor and replaced the sensor.
The car is still intermittantly rapidly overheating as indicated by the
temp gage. I showed her how to stop the car, open the hood, and see if
the cooling fan was running. She reports that it is.
I suppose that it could be nothing more than a defect in the temp gage
system, and the engine isn't really overheating, but the fact that the
gage sweeps up over a period of a minute or so and doesn't snap to a new
reading has me doubting that.
At this point my best guess is that something is causing the coolant
circulation to quit. My limited experience with Civics has me
remembering that the water pump is driven off the smooth side of the
timing belt, so perhaps there isn't enough tension in the belt to drive
the water pump properly and when the belt slips the pump stalls?
Thanks for any leads guys,
(W1BSV + Brass Rat '57 EE)
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