[KingMichaelR]

Hey everyone, I have a 2009 e90 335i x drive with the N54 engine.

The car is FBO, VRSF 7.5" step FMIC, CFS aluminum RAD, VRSF charge pipe and VRSF downpipe, stage 2+ tune.

I've been hearing the fan come on full blast when driving this week. I'm in Canada and it has been very hot an humid this summer week around 35 degree C (95F).

The car has no loss of power
No engine lights or codes
Coolant temp doesn't go above 225 - usually avg around 210 (maybe 226 when stuck in traffic)
Oil temp doesn't go above 120

Does anyone know what could be causing the fan to come one? I know waterpump is usually the cause but coolant/oil temps seem normal? Could it be a faultly temp senor? could the engine ambient sensor cause it to go off?

Once the fan kicks in it seems like its on until I shut the car off, it might come off for a second when stopped but then kicks right back on a couple seconds later.

I dont drive with AC either.

[eastsidaz]

MHD sport cooling is on? Its normal above 32C. Try stock cooling it wont do it till 37C