Fresh Air Blower Control Unit: What is it?

'Yes, what is this? I seem to need this for my Climatronic conversion (or at least I think so). Or is this already included in the manual air conditioning system?'
Sure, here's the translation:

'By the way: Can anyone provide me with the part numbers for a Golf IV, Passat 3B, or similar Climatronic system that doesn't use a CAN bus?'

Best regards, WarLord.

Well, 'control unit' is a bit of an exaggeration.
It's essentially a performance driver that receives an analog control signal (I believe it's 0-5V) from the Climatronic system and adjusts the fan speed accordingly.
So, you absolutely need this part. It's located directly on the fan motor, where the resistor is usually placed.


CU Gremlin.

Hm, wenn ich mir jetzt einen kompletten Heizungskasten hole, habe ich also gute Chancen so einen Leistungstreiber mitzubekommen. Okay, thank you.

Best regards, WarLord.