FWIW my radiator fan never kicks on unless it's summer, the car is fully warmed up and it's sitting for 5+ minutes after warmed. So if you're starting the engine from cold and expecting it to come on in a minute or two, I don't think it should. I replaced my sensor and relay once thinking there was an issue. After replacing that stuff it still didn't come on at idle. It only came on after the above conditions so I think that's the way it's supposed to work. Other guys on here have had fan issues and know more than me. Hopefully someone else can help or confirm.
Also, I've had the best luck bleeding the cooling system by revving the engine. I think even the BMW TIS says to rev it. I usually hold the revs at 3,000 RPM or so for a good 15 seconds with the bleed screw loose. It makes a terrible mess but seems to do the trick. Trying it at idle RPM does nothing for me - nothing will even come out of the bleed screw doing that.
Good luck! |