???
Mine hasn't been noticable at initial start up, even in the cold. It has been right around zero here lately. Seems worse once warmed and driving down the road. 55, 60, or higher it comes on as your accelerate and work it a lil' harder. I have tried fluctuating the throttle and even dropping into nuetral trying to narrow it down, but it does not seem directly linked to rpm...??
i am going to look at fan, clutch, belt, pulleys, and air filter SOON!