Auxiliary Air Fan

[rwagner735]

1989 325I convert. New to me. A/C not working. Charged system and all OK except Auxiliary Fan doesn't come on when A/C on. I expect it to come on immediatly. Runs when jumpered at radiator temp switch and also when jumpered at relays. Don't have wiring for system. What causes and how does fan get turned on when A/C turned on. Also should it also come on when "Recirculation" switch on?

[Wayne 962]

I'll have to check my E30 - I'm not 100% sure of the answers...

The AC system should blow somewhat cold, even if the fan isn't operating...

-Wayne

[BMWCowboy]

The fan only comes on at certain eng temps & certain a/c pressures
It doesnt just stay on

[makaio]

Sorry, I re-read the authors post, and I stand corrected, hence the edit.

[BMWCowboy]

Sounds like the fan & resistor are good if you can jump it.....does the fan ever come on????