Radiator fans not operating I checked relays?

1999 HONDA ACCORD
100,000 MILES • 4 CYL • FWD • AUTOMATIC
Avatar
CHARLIE B
  • MEMBER
  • 1 POST
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?
May 8, 2010 at 9:56 AM
Avatar
SQM
  • ✓Experienced 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.
Images (Click to enlarge)
Attached Media
Attached Media
Dec 14, 2021 at 6:34 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle