extricating my voltage regulator is a thermostat, albeit a somewhat superfluous one. can somebody explain its function? its item 10 in the pic.

Quote Originally Posted by ryan roopnarine
in the air filter box in the etk??????PLEASE???? i can only find pictures of the air box with a hole in the back, ie not in there.......looked in coolant and climate control.....rather not bug bill yet if i don't have to.... car is july 1991 production automatic 525i.