1987 TOYOTA COROLLA RUNS HOT UNTIL I TURN HEATER ON

  • Tiny
  • mjsbears
  • 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?

Tuesday, June 1st, 2010 AT 11:47 AM

3 Answers

  • Tiny
  • mhpautos
  • Expert
  • 30,498 posts

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)

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Tuesday, June 1st, 2010 AT 7:36 PM
  • Tiny
  • mjsbears
  • Member

I replaced the thermostat and things seem to be fine so far.

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Monday, June 7th, 2010 AT 3:04 PM
  • Tiny
  • mhpautos
  • Expert
  • 30,498 posts

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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Monday, June 7th, 2010 AT 4:47 PM

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