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1987 Toyota Corolla Runs hot until I turn heater on

Tiny
MJSBEARS
  • MEMBER
  • 1987 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 143,000 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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Tuesday, June 1st, 2010 AT 11:47 AM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 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
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  • 2 POSTS
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
  • MECHANIC
  • 31,937 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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