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I’m sure experts will chime in, but did you check to see if AAR (and AAV) are functioning? No idea how to check AAV, but AAR is relatively easy with a 12v source and freezer. I think they have a tendency to gunk up over time and the sliding disc may have stuck closed. I think it takes some creativity to get it off an SC runner, but you could probably check position of the disc with a mirror by disconnecting the big hose and seeing if it closes any more by applying voltage. I don’t think that they ever completely close, but you should probably see some movement on a cold/room temp engine vs 3-5 minutes of applying voltage.
Another Charles in Dallas
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