97 Ram A/C question

Thanks guys. I was able to trace the vacuum lines into the firewall and they looked good to that point. The 2 check valves are there and hooked to the intake port. I'll do some more digging around tomorrow.
Thanks, Paul

The check valves get clogged/dirty or leak internally. They're only a couple bucks. Replace them, it's worked on several trucks that I wrench on.