Why does my Mack truck fan always stay on?
Why does my Mack truck fan always stay on? Most of the time 85% it's on meaning it has no air in line to fan. I don't know if the Mack's work this way, but one of my F-Liners had a prob. like that and it was the A-C unit low on freon, even when the defroster was on and the A-C comp. would kick off an then the fan would kick off. But when the truck went up to temp. the fan would work OK Why does my fan clutch keep coming on and off? Fan clutch stays on....