Rad Fans doesnt turn on, only when the AC is on
 

Turbo GT86 with Spal Fans and FB rad with Mishimoto Racing Thermostate. Fans usually come on at around 87C but out of nothing the auto turn on stopped working. Lucky the AC still works and turns both fans at full speed...

Any idea of what could have happened?

check any relays connected to them or the wiring to the thermostatic switch for the fans. are you overheating?

Run a piece of wire between the two wires going to the thermostatic switch to see if the fan comes on. If it does the switch is bad.


If it doesn't check the relay related to the fan.