this is kinda ghetto. i eliminated my AC system because it was kaput and would have required much cash to repair it. when i did that i just wired a switch from the fan through a fuse to a dash switch. now when i'm sitting in traffic on a hot day or when i leave my car parked and idling i just flip the switch and the engine stays cool. i did this because the auxillary fan will not turn on without the AC being on also. since the AC was gone i was getting no benefit from the aux fan.
86' 190e 2.3L 16v