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Radiator fan does not turn on unless the A/C is turned on

Tiny
JOE DOYEN
  • MEMBER
  • 1995 TOYOTA CELICA
  • 1.8L
  • 4 CYL
  • 2WD
  • MANUAL
  • 179,000 MILES
I have the car listed above 5 speed transmission. I’m not 100% sure but I believe it to be the coolant temperature sensor and was wondering the location of said sensor. I have 2 by where the lower radiator hose leads to the engine. I’m not sure if it’s the one with 1 wire or the one with 2 wires.
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Wednesday, December 4th, 2019 AT 8:44 AM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This could be the ECT but we need to see what the ECM is seeing from the ECT sensor. The sensor could be fine but if the ECM is not reading properly then it will not turn it on. You should have two fans. One turns on based on the coolant temp and the other only turns on when the AC is on.

So we can test the sensor and if faulty then that may be the result but if it tests ok, then we need to monitor the ECM with a scan tool and see what it is reading.
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Wednesday, December 4th, 2019 AT 3:32 PM

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