Radiator fan stopped working

Tiny
BEASTMODE666
  • MEMBER
  • 1988 TOYOTA COROLLA
  • 1.6L
  • 4 CYL
  • 2WD
  • MANUAL
  • 155,467 MILES
Hello, I am having issues with my car. Recently my radiator fan stopped working which caused my car to overheat. I disconnected the temperature sensor that is under the distributor and turned the ignition on but fan does not turn on. Does that mean my fan is broken and need replacing or the sensor? Thanks for you help
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Wednesday, March 14th, 2018 AT 4:12 PM

5 Replies

Tiny
CARADIODOC
  • EXPERT
Your car uses a coolant temperature switch to turn on the radiator fan relay. That switch has a single wire plugged onto it. It is a light green wire. Unplugging that switch would turn on the radiator fan by default on newer cars, but on yours, that wire must be grounded to turn the relay on. If the fan runs when you ground that wire, the rest of the circuit is working and the switch is suspect.

If the fan does not run when the switch is grounded, start by checking the 30-amp "radiator fan" fuse link. If that is burned open, the common suspect is the fan motor has tight bearings. Replace the motor, then the fuse link.

If you hear the fan relay click when you ground the light green wire, but the motor does not run, check for twelve volts going to the motor on the black/red wire. If you have it there, check the ground wire for continuity. If that is okay, suspect worn brushes in the motor.

If you do get the fan relay to click, but there is no twelve volts to the motor, suspect arced contacts in the relay.
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Sunday, October 25th, 2020 AT 11:43 AM
Tiny
BEASTMODE666
  • MEMBER
Thanks for the fast reply! I grounded the fan and it started working, thanks for the help. Now would the switch be the connector from the car to the fan? I could find at junk yards right?
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Sunday, October 25th, 2020 AT 11:43 AM
Tiny
CARADIODOC
  • EXPERT
You grounded the fan wire or the wire to the coolant temperature switch? If you grounded the wire at the switch, and the fan turned on, the switch is defective or there's a bad connection on that connector terminal. The switch is likely to have a low failure rate, so I'd be happy with a used one from a salvage yard.
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Sunday, October 25th, 2020 AT 11:43 AM
Tiny
BEASTMODE666
  • MEMBER
I grounded the fan wire, so that means the switch is bad right?
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Sunday, October 25th, 2020 AT 11:43 AM
Tiny
CARADIODOC
  • EXPERT
Everything else worked, so either the switch is defective or the terminal in the connector isn't making good contact with the terminal on the switch.
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Sunday, October 25th, 2020 AT 11:43 AM

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