Aux fan question

[bugbyte]

Hi Guys,

I had this car for a little over 2 months, and I noticed that my AUX FAN never comes on no matter how hot the temperature outside is (someday up to 99 degree F) with heavy AC usage. Should I be worry and check it out? If so any instructions on how to diagnose see if the FAN is properly working.

[bastereo]

The AC system will not work if the auxiliary fan is dead.
It may be on low speed, so its quiet.
Or like my co worker, look closer, there is a fan looking thing inside the shroud along with the fan.

[bugbyte]

The fan is there but it is not running. I might need to run the test manually and see if it is still alive. Anyone know is there a sensor that control the fan speed or give it a kick start?

[Yarno]

Does anybody know what the deferences are between the diesel aux fan 64546921382 and the petrol (gas) aux fan 64546921381? Is it just shroud shapes or is it something electrical?

[Yarno]

So no one has any electrical schematics?

I am thinking of trying the v8 fan because the cheapest I can find the diesel one is $800+shipping. Way too much. Or I was thinking of pulling the fan and trying to repair it. Anybody done this?

Any help would be appreciated.
Cheers
Yarn.