aux fan problem

[daveking]

Hi all
AC has not worked since i have owned the x5.

The aux fan does not spin.
I have unpluged the sensor on the AC pipe but still
no fan spin.
Checked the 50amp fuse and thats ok.
Found there is no 12 volts to the connector to the fan just 3.4v at the thin
signal wire.
I tried by putting 12 volts to the fan plug but nothing.

Thank you all in advance.

very hot dave king

[Clavurion]

So did you check that continuous voltage from the fuse to fan? That thin wire is PWM signal from DME. You can activate it with diagnostics or PWM signal generator. Direct voltage on PWM wire won't work.

[upallnight]

Originally Posted by daveking

Hi all
AC has not worked since i have owned the x5.

The aux fan does not spin.
I have unpluged the sensor on the AC pipe but still
no fan spin.
Checked the 50amp fuse and thats ok.
Found there is no 12 volts to the connector to the fan just 3.4v at the thin
signal wire.
I tried by putting 12 volts to the fan plug but nothing.

Thank you all in advance.

very hot dave king

That "Thin" wire provides what is known as a modulated pulse signal to the electronic in the fan. Get a scanner that can read BMW code and do a scan of the X5. A bad fan will show up in the DME module.

[daveking]

Hi
thanks for your reply.
I have read that the fan should
have a permenant 12 volts which
i don't have.
As i said fuse is fine.

thank you.

Dave king

[upallnight]

Originally Posted by daveking

Hi
thanks for your reply.
I have read that the fan should
have a permenant 12 volts which
i don't have.
As i said fuse is fine.

thank you.

Dave king

Did you check all of the 50amps fuses? I believe one is a Spare and it doesn't provide power to any circuit.

[daveking]

Hi
i got 14 volts both side of the big green fuses.
even removed the and checked for corrosion.

Thank you.

[Clavurion]

Did you check the voltage on the 50 A fuse base? Can you give the specs of the vehicle.

Edit: You already answered the first one.

[Purplecty]

If the aux fan is bad or non functional it will throw a DME error. Check for errors in the DME...

[daveking]

Ok thank's for the reply's.

will fire up inpa later and let you know what i get.

[Clavurion]

If you really don't have voltage on the thick red/blue wire on the fan connector diagnostics won't give us any more information. If we are talking about pre-facelift built before 9/2003 check the continuity/resistance on that supply wire between fuse F61 and fan connector.



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