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krl · 05-11-2015, 10:41 AM

Hi all,
I've had an overheating problem and am diagnosing why the second fan (drivers side) doesn't come on. Some posts say if AC is turned on, both fans should come on. Only my primary fan comes on with AC. Some posts say one is triggered with the AC and the other is triggered based on coolant temp.

Hooked fan to battery and proved wires and motor are good.
Swapped fan relays - no change.

Primary fan comes on with AC but no second fan. Ran car up to temp (engine temp of 215), pulled over and checked under hood. No second fan running.

Is there any way to validate proper operation of the second fan while car is sitting in the driveway?

Thanks for any help.
Keith

05-11-2015, 10:41 AM	#1
krl Junior Member Join Date: Jul 2012 Drives: blue brz Location: LI NY Posts: 8 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	When does second radiator fan come on? Hi all, I've had an overheating problem and am diagnosing why the second fan (drivers side) doesn't come on. Some posts say if AC is turned on, both fans should come on. Only my primary fan comes on with AC. Some posts say one is triggered with the AC and the other is triggered based on coolant temp. Hooked fan to battery and proved wires and motor are good. Swapped fan relays - no change. Primary fan comes on with AC but no second fan. Ran car up to temp (engine temp of 215), pulled over and checked under hood. No second fan running. Is there any way to validate proper operation of the second fan while car is sitting in the driveway? Thanks for any help. Keith