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Radiator fans not operating I checked relays?

Tiny
CHARLIE B
  • MEMBER
  • 1999 HONDA ACCORD
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 100,000 MILES
My electric fans are not going on, I checked relays and connected fans straight to battery and they work. Is there a sensor or something else I need to know about? And where is it located?
Saturday, May 8th, 2010 AT 4:56 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

The radiator fans can be inoperative due to bad relay, wiring issues, bad motor or faulty coolant temperature sensor.
Since you have already ruled out the fan and the relay and the wiring. It could be a faulty coolant temperature sensor. The coolant temperature sensor that sends the signal to the ECM, which triggers the fan to come on.
Bad sensor will be unable to send correct signal and that will lead to an inoperative fan.

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

The coolant temperature sensor is located on the right-hand side of the engine (see picture below).

Please let me know if you have any questions.
Thank you.
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Tuesday, December 14th, 2021 AT 2:34 PM

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