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supereal · 08-21-2021, 11:34 AM

Most accessory cooling fans are driven by an electric motor which is controlled by a thermal sensor. I haven't seen a belt driven type operated by a clutch such as used by the AC compressor. I assume you can test the clutch with an ohm meter to confirm that the winding is complete, and the controller is, in fact, working, which is how we test the AC type. Confirm that the clutch is receiving power, and bypass the switch to see if the fan comes on.

08-21-2021, 11:34 AM	#2
supereal Senior Member Join Date: Jul 2014 Location: Iowa Posts: 1,634	Re: 59ab accessory electric clutch fan Most accessory cooling fans are driven by an electric motor which is controlled by a thermal sensor. I haven't seen a belt driven type operated by a clutch such as used by the AC compressor. I assume you can test the clutch with an ohm meter to confirm that the winding is complete, and the controller is, in fact, working, which is how we test the AC type. Confirm that the clutch is receiving power, and bypass the switch to see if the fan comes on.