While were on the subject, all W140 owners pay attention! If you've ever had to lay out $$$ for a new blower motor regulator, keep this in mind. The incoming air is what cools the darn thing! If the filter is restricted, guess what! If your filter is filthy and you don't want to replace it, just take it out and save yourself the hassle of frying the regulator! Of course, the twigs and leaves will make a racket inside the motor, but it won't cost you .