At what coolant temperature does the radiator fan kick in?

Post by **oragex** » 03 Oct 2018, 11:48

I've been using the Torque app and the coolant temp reached 98C when the car was in P (not moving), yet the radiator fan didn't kick in. In warm summer days the fan kicks in as it should if I turn the A/C on.

When the car is moving, the coolant temp sits between 87C-92C or so (the airflow cools down the radiator).

Is this a normal temperature (98C) and if so, at which temperature does the fan start? To me it seems high because the thermostat is fully open already by 91C.

Post by **jimmy57** » 03 Oct 2018, 18:45

The fan will come on at 104 to 106 C and go off at 96-99C. The pressure cap is 21 psi The coolant temp is the exit temp for engine and is way below boil as long as cap is on. If a/c is on then the fan is running for a/c pressure purposes and never goes near that high.

Post by **oragex** » 03 Oct 2018, 19:55

Makes me feel better. I'm still surprised, why would the thermostat fully open as low as 90 C while the fan kicks in only at 105 C - the later definitely happens only if the car is not moving.