I have had this problem on a Freightliner chassis. However I think it will manifest itself the same way.
In my case it was a split in a small rubber transition hose that connected a vacuum line made out of nylon to the metal hose connector of a vacuum valve. I would look for that and there are several that controls which way the air will flow. Trace the hoses from your control on the dashboard and you should be able to find out where they go.
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Harry
2015 Tuscany 40 KQ
2013 Honda CR-V
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