Mechanics

RUNS HOT UNTIL I TURN HEATER ON

1987 Toyota Corolla

Engine Cooling problem
1987 Toyota Corolla 4 cyl Front Wheel Drive Automatic 143000 miles

My daughter's 87 Corrolla has recently starting running hot. The higher the speed the hotter it runs. By turning on the heater, this does bring the temp gauge down a bit. There are 2 fans blowing on the radiator and both work. Coolant level is good.

Is this a bad thermostat or plugged radiator?
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Mjsbears
June 1, 2010.




Hi there,

I would change the thermostat replaced as a matter of course, and get the radiator cleaned as I feel that it may be part blocked, a flush will not be good enough, a full core clean is required.

Mark (mhpautos)

Mhpautos
Jun 1, 2010.
I replaced the thermostat and things seem to be fine so far.

Tiny
Mjsbears
Jun 7, 2010.
OK, thats a good sign then, just keep an eye on the temp gauge, if it starts to pendulum, (going up and down, not staying steady) do the radiator as well.

Mark.
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Mhpautos
Jun 7, 2010.

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