Just got a diagram from Arthur Dalton that has a 3 way control switch for low speed, high speed, and factory settings! Gonna look into that. I was asking about high speed, because I live in the desert and in about another month or so the average temp outside will be 105*F-112*F so even with the low speeds on, the car temp gauge will still rise to the point where the high speeds will turn on. Typically in stop & go traffic, but not usually when I'm in motion 30-40 mph, maybe less

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1990 190E 3.0L