My '04 doesn't have any airflow thru the cab at highway speeds with the fan turned off. With the engine off and ignition on, I can turn the fan off and hear the damper operating to APPARENTLY cut off the outside air. Anyone else noticed and wondered about this. I never had to run the fan before this truck just to have a little fresh air coming in. FWIW, the DC Answer Man says there should be flow without running the fan.
Also, since I put a hose on my AC evaporator drain (love that cost-cutting), I've noticed a definite decrease in the crankcase vent pipe smell (not that I cared..... I kinda like that fragrance... au de Diesel).
Also, since I put a hose on my AC evaporator drain (love that cost-cutting), I've noticed a definite decrease in the crankcase vent pipe smell (not that I cared..... I kinda like that fragrance... au de Diesel).