David

Sounds like it might be time to pull the drivers side panel and check out the selector valve, they usually last a long time but it could be bad. Big leaks are easier to find so when you start checking the lines to and from that selector valve you should spot it. You have a mity vac of some vacuum checker?

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"