bakedalaskan1 wrote:
Ford has a technical service bulletin that addresses this. It fixed this situation in my 2001 Winnebago. I replaces the vacuum reservoir with a larger unit. TSB 02-07-02 AC COMING OUT DEFROST.pdf
Hmmmmm, imagine that, a fix WITHOUT the addition of an auxiliary vacuum pump. I surely understand that Diesels do not produce vacuum therefore, there is a need for a vacuum pump. But, gas engines DO produce vacuum and, have stored it in one or more storage vessels forever. To me, this situation would similar to a diesel coach with a fair sized air leak. And folks would just add an auxiliary air compressor to augment the engine driven one, to keep up with the air leak, rather than fix the leak. Same thing, only pressure instead of vacuum.
Now, maybe the OP has taken his coach to various techs and, so far no luck in finding the culprit but, the fact remains, there's a leak SOMEWHERE and, all those techs just haven't found it. Seen this kind of thing many times where multiple attempts to repair an issue
failed and then, someone comes along and jumps right to the problem.
Scott
