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Cooling fan does not come on

Tiny
ESPRI
  • MEMBER
  • 1991 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • MANUAL
Good day. I have a Toyota Corolla, 1991, 1.6 GLS (AE92). Just recently there have been issues with the cooling fan. When the thermostat switch is connected, the fan will not come on at all. When disconnected, the fan works continuously. I removed the thermostat but still no change. The heat gauge also remains just below the halfway mark, but the radiator will start to overheat and blow the cap off the overflow bottle. I also changed the fan regulator which I noticed is getting extremely hot. Could the problem be the regulator or the thermostat switch?
Thanks for any advice.
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Monday, December 20th, 2010 AT 12:11 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
If it is overheating and not showing it, the temp sending unit doesn't seem to be working. Have you replaced the cap? As far as the fan, have you checked the fan relay?
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Sunday, October 25th, 2020 AT 11:42 AM
Tiny
ESPRI
  • MEMBER
  • 9 POSTS
Hi Jacobandnickolas

I have changed the fan relay but no change in the problem. The radiator and cap is a year old. Should I change the cap as well? Also, please can you advise where I can find the temp sending unit on this car?

Many thanks
Espri
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Sunday, October 25th, 2020 AT 11:42 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
No, if you replaced the cap once and it does the same thing, it should be fine. This has me confused because the radiator overflows but the temp in the vehicle shows normal. Are you sure there isn't a radiator hose pincing shut when the engine overheats? And as far as the fans, there has to be a short in the wiring or a problem in the PCM.
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Sunday, October 25th, 2020 AT 11:42 AM

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