air cond question

[Yarno]

OK got my new fan from Schmiedmann, ended up about $540USD delivered. Plugged it in and away it went. Installed it this morning and it is all working fine. Thanks everybody for the help.

[mysweetx5]

Well for me, the link file were unable to open, but as a guy who like to figure out stuff
I ended up removing the two screws that held the aux fan in the bottom, and also pulling
the entire bumper half way down. But unfortunately I still Not able to see how the aux
fan will come out (It is from the back or coming out from the front bumper??

Otherwise I have similar symptom as described above like Not having enough A/C
when stopping/or car blowing hot air inside. And I went and bought a new fan on ebay.
I set the new aux fan on top of the engine, unplugged the old one while still on the car, plugging the new one in the same plug, now I went to start the car and put the A/C on

After 3second, Boommmmmmm the new Auxiliary fan kicks in while sitting on top of the engine cover. So, this was a good sign showing me that the old culprit wasn't working.
and I plugged the old one back, but the culprit wasn't spinning at all.

Now I just wanted to ensure where the aux fan comes out. front? or back?
(2001 BMW X5 4.4i)

[upallnight]

Originally Posted by bigwave2255

hmmmm, hard to know what to do, i still think the gas level needs checking first, then maybe the fan.

why couldnt it be a simple 12v supplied = fan on no 12v fan off, with this pulse thing it makes it all that much harder to fault find, or am i missing something

The pulse governs the speed of the fan. The faster the pulse the longer the fan is engaged so it will spin faster whereas the slower the pulse the shorter the fan is engaged so it will spin slower. This eliminate the use of resistor packs and everything is controlled by the DME.

If the fan is not working the computer will know that it is not working and store a code for a fan failure, but that type of failure will not trigger a CEL or SES or MIL. Get the X scan to see if there is a problem with the fan instead of throwing parts at it.

[upallnight]

Originally Posted by mysweetx5

Well for me, the link file were unable to open, but as a guy who like to figure out stuff
I ended up removing the two screws that held the aux fan in the bottom, and also pulling
the entire bumper half way down. But unfortunately I still Not able to see how the aux
fan will come out (It is from the back or coming out from the front bumper??

Otherwise I have similar symptom as described above like Not having enough A/C
when stopping/or car blowing hot air inside. And I went and bought a new fan on ebay.
I set the new aux fan on top of the engine, unplugged the old one while still on the car, plugging the new one in the same plug, now I went to start the car and put the A/C on

After 3second, Boommmmmmm the new Auxiliary fan kicks in while sitting on top of the engine cover. So, this was a good sign showing me that the old culprit wasn't working.
and I plugged the old one back, but the culprit wasn't spinning at all.

Now I just wanted to ensure where the aux fan comes out. front? or back?
(2001 BMW X5 4.4i)

If the fan is in front of the bumper it comes out from the front. But you must also remove the actual metal bumper that the bumper cover covers. Why? Because there are two plastic shrouds that are located in front of the fan and the only way to remove them is with the actual metal bumper off. The shrouds are held in place with 2 plastic rivets on each shroud.

[mysweetx5]

Thinks upallnight for the info
However I got through half way there, but I hate thinking that I had also
to remove the metal bumper in the back of the plastic cover. Unfortunately I was unable to finish the job yesterday because of this. So now I know what
to look for and I will get through it eventually.

01 x5 4.4i

[upallnight]

Originally Posted by Yarno

Checked the signal coming from the black wire on the fan with an oscilloscope and found it very eratic. It is showing a square wave PWM signal but it was between 3-5volts while the fan was turning and when it was stoped it was all over the place .44V to 2V.

I also have another spare new fan here that I plugged in and it did the same thing, stops after about 10secs.

Does anybody know where the signal comes from? or have and schematics.

Pulse signal for the fan comes from the DME. DME only provide a signal when the ac switch is activated and the system is running. If the system is not running due to low refrigerant, the DME does not pulse the fan. Not sure if the DME detects a bad fan if it will turn on the compressor for the ac system to work.

[mysweetx5]

Originally Posted by Yarno

OK got my new fan from Schmiedmann, ended up about $540USD delivered. Plugged it in and away it went. Installed it this morning and it is all working fine. Thanks everybody for the help.

Yarno! Happy that you've got your aux fan working now, but do you remember
how and where you got the auxiliary fan out? Did you slide it out from the front
after entire bumper was removed, or it came out from the back.

Thanks for any input you may have in regards...

(01 X5 4.4i)

[Yarno]

Originally Posted by mysweetx5

Yarno! Happy that you've got your aux fan working now, but do you remember
how and where you got the auxiliary fan out? Did you slide it out from the front
after entire bumper was removed, or it came out from the back.

Thanks for any input you may have in regards...

(01 X5 4.4i)

Fan defiantly comes out the front.

http://www.xoutpost.com/articles/x5/...r-removal.html

http://www.xoutpost.com/bmw-sav-foru...ditioning.html

[upallnight]

Once you remove the two bolts that secure the fan housing to the radiator frame, you can pull the fan down.

[mysweetx5]

Very Appreciated Upallnight!!! What's a good confidence you give me...
I'll keep you guys posted on the outcome and possibly taking a few pics.