When do radiator fans turn on?

[paranoidTSi]

I noticed something interesting that I never noticed in the past year I've had the car...I have never witnessed neither of my radiator fans turn on I assume it has been like this for awhile now, I've also never overheated too. At what point are these fans supposed to be working?

 

[markGSX]

You can test whether they're working by turning on your AC. Both fans should start spinning.

 

[latvianrkey]

i have the same question. I know both fans turn on when the AC is activated, but the question remains...if I do not have the ac on, at what temp does the radiator fan turn on, and at what temp do they both turn on? For clarification, the AC fan is on the driver's side, and the radiator fan is on the passenger side. Someone please correct me if I am mistaken.

 

[dave99gst]

around 225-230deg i think is the area they kick on

 

[Tailchaser]

you can check at the relays by just grabbing a wire and closing the circuit with the relay out. The fans will turn on if all is well or if the relay is bad.