Auxiliary Fan (Compression Shroud) DIY [Air Conditioning]

[corNIC]

Yes this fan is quite the mystery for such a simple part. I would also like to point out that if the fan connecter on my car is not connected the AC condenser will not even attempt to turn on lol. I agree replacing teh thermostat should not fix this issue. I guess I'm going to also test the voltage on my power leads. I think I am correct in assuming that 12V should always be there even if the small wire is not connected.

[mysweetx5]

Now I'm also requiring about this sensor part pictured below
because a few owner claimed to replace it and turned out to be the issue
And that could be the same problem for you as well. Now I'm just
following another forum on this, to ensure that this is the culprit
that caused my auxiliary fan to not running. If this the case than,
it would be one of the easiest repair than ever because this sensor is
located upfront just above the radiator on the inside, and it this NOT expensive at all.

Otherwise, this aux fan seems not that important on BMW's!
I guess you want to know why I say that?

1-These no such warning light/indication to tell you that aux fan has failed
Ex. check brake light, check coolant level, check fog lamp, washer fluid low

2-Found a few BMW's that comes with it, and some of them don't have it which are the same year/model as well.

(when I tested the head connector that bring the power, YES there's power there even when the engine's not running)

[corNIC]

Originally Posted by mysweetx5

Now I'm also requiring about this sensor part pictured below
because a few owner claimed to replace it and turned out to be the issue
And that could be the same problem for you as well. Now I'm just
following another forum on this, to ensure that this is the culprit
that caused my auxiliary fan to not running. If this the case than,
it would be one of the easiest repair than ever because this sensor is
located upfront just above the radiator on the inside, and it this NOT expensive at all.

Otherwise, this aux fan seems not that important on BMW's!
I guess you want to know why I say that?

1-These no such warning light/indication to tell you that aux fan has failed
Ex. check brake light, check coolant level, check fog lamp, washer fluid low

2-Found a few BMW's that comes with it, and some of them don't have it which are the same year/model as well.

(when I tested the head connector that bring the power, YES there's power there even when the engine's not running)

This has to be it. I have also seen this part on mine as well but wasn't sure. Does anyone know what it is actually called? Going to see if the local store has one and just go ahead and replace this after I test my voltage which i highly doubt is the issue.

[mysweetx5]

i's called Auc sensor (Automatic Recirculated Air Control)