E46Fanatics - View Single Post - E46 COOLING SYSTEM GUIDE - overheating/coolant/etc
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Old 09-18-2012, 03:22 PM   #557
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Join Date: Aug 2012
Location: Gulfport, MS
Posts: 511
My Ride: 2002 325i
Originally Posted by Raymond42262 View Post
...I was rechecking things and I found that the sensor is not properly installed. I thought I did it right but when I felt underneath it was loose.

I think I remember twisting it to remove it, but when I got under the car and tired to twist it did not respond.

Surprisingly, it is not leaking....
The water level sensor in the expansion tank goes into an air cavity that is separate from the coolant area of the tank. There's no seal on the sensor and you can remove it without any coolant coming out.
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