Location for this on 97ŽE39... [Archive] - Bimmerfest - BMW Forums

: Location for this on 97ŽE39...

11-08-2007, 07:24 AM
Right now, its just hanging loose at the left side of the radiator.

It's the clean-air recirculation sensor for the climat control (which has be fitted by the dealer).

Best regards


11-08-2007, 08:36 AM
It's mounted on the side of the radiator shroud (often the mounting breaks) and its purpose is to monitor the levels of oxidizable gasses in the air stream flowing through the radiator. Once a set threshold value for the level of gasses is exceeded, the recirc flaps are opened until the noxious levels drop (at which time the fresh air flaps open again), but not to exceed a 3-minute time limit when heating or a 12-minute time limit when cooling. The system is designed with those time limits to prevent fogging.

(From another thread that comes up if you search for the part number '64118391470' on the forums)