Greetings,

This is a question about electric aux fan testing. Not the Viscous fan as it works and test as it should. Prior to recently installing a 180 Tstat (old one was bad) I saw coolant temp momentarily at 220F. The electric fan did not come on. The research I’ve read that coolant temp above 210 is one of the triggers for the aux electric fan. This is a new fan, 40a fuse not blown but replaced, relay replaced, fan jumped direct to the battery to confirm it works. The question I have is with current cooler temps is there a way that the logic of the fan can be tested for operation? Also what Is the coolant temp sensor for this? Does it get it from the ECM?

 

Page 4-10 of the RAVE manual says the switching point is 212F.

The logic is laid out in page 4.90 of the Electrical Library. It looks fairly simple; I would check your wiring to see if there's an open circuit.

 

so as luck would have it it warmed up
enough in my area that I was able to confirm that the aux fan is working now. Must have been the relay or the fuse.
thanks for the info from the RAVE manual.

 

Does it come on when you turn on the AC and the vehicle is stopped?

 

Yes the ac was on and the vehicle stopped

 

If the electric radiator fan is coming on when you switch on the AC, then it's not the fan.