The thermostat is a heat operated valve that opens when the coolant
in the engine reaches operating temperature. I has no electricity
running to, or through, it. It does not weld itself closed, or open.
When it fails it will either remain partially open and the engine will
take forever to warm up, or it will open late and the engine will run
real hot and then suddenly cool. What you probably mean is that the
temperature sensor for the fan has failed, and the contacts on it
are welded closed. Which is the most likely cause of the problem.
It is fairly common for the power for the fan to run directly through
Damn it . . . Don't you dare ask God to help me.
Could be the sensor or relay that turns the fan on provided the temps
are cold when it's on....
But check to see if the AC is accidently turned on... tonight I noticed
the cooling fan was on when the engine was cold in my winter car...
I wondered why and figured I have to chase that down.... then I noticed
the AC button had been pushed accidently. I turned off the AC and heard
the fan click off.
Eeeeww - 1.4L? Sheesh, I had a U.S. built 1.6L and it was the worst
engine I've ever come across.
In any case, I'm wondering if someone didn't do the usual trick when the
fan relay system dies - that is wire around it so the fan just runs
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