I know that with the clutch fan, that a "roaring" sound is normal, but I do not think mine is working enough. I am wondering - when I first leave in my car and get on the mail road and accelerate, the fan will roar, like it is really pulling in air, but then when I get to about 40 MPH, it slows down. I NEVER hear it again throughout the day, even when the engine temperature surpasses 100*C. Shouldn't I be hearing this fan more often, especially when the engine temperature goes past 100*C? BTW - my car is a 1985 W126. Since it is working initially, does that mean it is OK? I am just wondering, because I have had cars in the past that roars most all of the time.

Thanks.