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Message: <blockquote data-quote="pussy" data-source="post: 626488" data-attributes="member: 60">yes... there is a switch...but the AC unit for the e34 is built in for 3 modes..one for winter, AC on and radiator usage.Forget about winter, it only works if the car is in Greenland :burnout:as for the AC is on when the AC switch is on. Off the switch, it stays off, simple..For the radiator, it's on automatically when it reaches a preset temperature, say 81deg.C The second speed comes on at 88deg. C Some comes on earlier, like the e39 which is variable up to 7 speeds..By the way, how do you know if the fan is on at over 200kph ? if the AC is off, then it's off... if the AC is on, then it's on...</blockquote>