There are 2 water temp sensors on the M54: Cylinder head, and coolant outlet at the radiator. The one on the cylinder head is used to run the EMS adaptations, and also the thermostat switching. The one at the radiator runs the fan.....I've only ever seen temps from the cylinder head sensor....and I'm not sure if most monitoring software even looks at the radiator temp sensor.
Edit: Here's what I was able to monitor in 2009...looks like I was watching both. Note the temp range available as well:
One good piece of info is that the radiator fan is controlled by a solid state relay that is mounted onto the fan assembly. (Thats the black blow a the top) This means you can use a low level switching signal to control the fan if you want externally.
Steering rack leaking? I had this problem a few years ago...
I never killed my pump, but you will if you run it for a while like this. It would be pretty obvious though, as the steering at slow speeds would be a handful. (Manual steering)
Well its done with the exception of the Power steering. Right now I am using the M3 Pressure plate with the stock clutch and it seems to be holding fine(car hasn't seen full boot though). I have a new clutchnet Kevlar clutch but I won't put it in unless I need to.
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