Bmw X5 3.0d E53 Pusher fan not starting

[ak505]

Hi all.
I need some advise.
My X5 E53 3.0d's pusher fan does not come one, this results in the air-con not working when the vehicle is standing, while idling obviously, when the vehicle moves the air-con works fine.
I noticed the pusher fan does not turn on, however, i noticed it turn a bit and stops again so i suspect it must be a switch or something.

Any advise to what i should look at first.

[wpoll]

Originally Posted by ak505

Hi all.
I need some advise.
My X5 E53 3.0d's pusher fan does not come one, this results in the air-con not working when the vehicle is standing, while idling obviously, when the vehicle moves the air-con works fine.
I noticed the pusher fan does not turn on, however, i noticed it turn a bit and stops again so i suspect it must be a switch or something.

Any advise to what i should look at first.

The best way to determine the operation of the Aux. fan is via INPA, DIS or ISTA, where you can manually turn the fan on (in INPA its called the e-blower, in the activation menu).

I hear you can also pull the connector off one of the A/C pressure switches (cannot recall which one - high or low) and this should cause the Aux. fan to run but I cannot confirm this is so (or that it works on the diesel cars).

There is no "switch" that operates this fan - it is under PWM control from the DDE and it's rather hard to diagnose properly without INPA, DIS or ISTA. The fan itself contains a complex controller and motor driver circuit.

If you see even small twitches from the Aux fan, I think you can assume that the main fuses are OK....

[wpoll]

Post #56 here...

https://xoutpost.com/bmw-sav-forums/...fan-bad-6.html

[upallnight]

If you have a BMW specific scanner or software a bad fan will show up in the DME module.

[upallnight]

Or you build a PWM signal generator to see if it is the FAN.