fan for cooling engine

1992 TOYOTA COROLLA
FWD
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JOH
  • MEMBER
  • 11 POSTS
sometimes the fan comes on when you start the engine,a next time when the engine is hot,it should come on,, but it won't.What is causing this to happen ?
Dec 10, 2010 at 10:32 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Check and test the coolant temperature gauge switch and fan relay
Dec 10, 2010 at 10:34 AM
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JOH
  • MEMBER
  • 11 POSTS
I have change both , but the problem is still there . Both are good, because i tried them in another car.
Dec 13, 2010 at 3:56 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Check the fan relay if okay there's a problem with the computer controlled circuit of the fan relay
Dec 13, 2010 at 6:02 PM
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JOH
  • MEMBER
  • 11 POSTS
How does the thermoswitch works ?
Dec 20, 2010 at 7:35 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Its heat calibrated (resistances) its open when cold and when hot the switch closes and transfer power to the fan motor
Dec 20, 2010 at 12:58 PM
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