Cooling system fan not working properly

JIMMY CURLEE

MEMBER
1992 HONDA ACCORD
160,000 MILES

My coolant fan is only working when my air conditioner is on. I've checked the relays and fuses everything is good there when I shut the car off the fan runs for 10 minutes but never comes on during operation. I can't find the schematics for the coolant temperature switches and all the other switches that I need to check what can I do. Please help me.

3 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I'm Danny.

Your car should have 2 electric fans.One fan will come on and stay on continuously when you have the air conditioner on.The second fan which you say is not working should come on when the engine is running to prevent overheating.That will be controlled by the coolant temperature sensor.It sounds like that switch is defective or not working.Here are a few tutorials for you to view showing its replacement and operation:

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works

https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

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

I've attached a picture below showing its location on your car.It's near the distributor and thermostat housing.Hope this helps and thanks for using 2CarPros.

Image (Click to make bigger)

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Sunday, September 13th, 2020 AT 3:48 PM

JIMMY CURLEE

MEMBER
3 POSTS

Okay, thanks. There's also a coolant fan switch on front of the car and the plastic housing is all broke up but I've checked it for good contact. How do I check to see if that sensor or the power supply going to the other one is good?

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Sunday, September 13th, 2020 AT 5:00 PM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

If you can use your cell phone and take a picture of the broken plastic housing to see what you're talking about and upload it here. Hope this helps and thanks again for using 2CarPros.

Danny-

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Tuesday, September 15th, 2020 AT 4:45 PM