I have a problem with no Power to the AC clutch. I can power at the lo pressure switch and ingauge system and the comperssor will ingauge and run. The sight glass clears up so I know it has freon. This happened all at once . Have no fuses blown. Does this power come from the ETR Switch? Or Switchover valve?I would also like to know the Fresh air flap green and rd vacuum hose connections to the vacuum 2 stage morors. for the main air flap.