Radiator fan not working

Tiny
MEDOVEL
  • MEMBER
  • 2002 MITSUBISHI LANCER
  • 150,000 MILES
Radiator fans are not coming on. Replaced the fuse. Can you tell me where the coolant sensor for the radiator fans is? Thx.
Saturday, July 21st, 2012 AT 5:04 PM

4 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
There is no coolant sensor for the fans becasue the PCM controls it here is a wiring diagram for the cooling fans so you can see how it works and the fuse and relay locations so we can test for power. Use these guides to help.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Saturday, July 21st, 2012 AT 5:42 PM
Tiny
MEDOVEL
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  • 2 POSTS
Okay, I presume from your answer, coolant temperature sensor does not regulate the fans, and there should be hot/electric going into the fan controller at all times. (I did replace the relay - I said fuse, but meant relay.)
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Saturday, July 21st, 2012 AT 11:54 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
FANÂ CONTROLLER

1. Remove the fan controller connector. See Fig. 3Â.
2. Turn the ignition switch to the ON position. Check for battery voltage between terminals No. 1 and 3. See Fig. 3Â.
3. Reconnect the fan controller connector and disconnect the condenser fan motor connector. See Fig. 4Â.
4. Ensure the A/C switch is off,  and start the engine and rub at idle.
5. Measure voltage between the fan controller (side connector) terminals. Voltage should be 1V or less.

CAUTION: Stay clear of the fan when starts running.

6. Turn the A/C switch to the ON position.
7. Measure the voltage between the fan controller (side connector) terminals while the fan is running. The voltage should switch between 5.6 10.8V and battery voltage.
8. If the voltage does not switch as indicated,  replace the fan controller.
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Sunday, July 22nd, 2012 AT 12:02 AM
Tiny
BOOPERIII
  • MEMBER
  • 1 POST
Replace the fan relay cost me $34.00. Good as new
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Friday, December 28th, 2018 AT 11:20 AM

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