Hi there, I have a problem my Navistar 3700 T444e doesn't compress air any more. I just started the engine and the red light voor compression stay on and no air in the system. What can be the problem?:
If there's pressure but no rise, compressor or governor. If there's no pressure at all, it could be as simple as a bad leak, or major as a compressor. One way to know, air up the tanks with the engine off and listen for leaks.