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I had something similar happen this year and it was a hole in the air line that runs from the compressor to the dryer. As Richard said you can't hear it with engine running. If you can hold your thumb over it that would be my guess. In my case there was ZERO shielding on that hose as it draped over the bell housing area. So that how was allowed to just sit there and rub for 20 years until it had a nice hole. Newell does so many things extremely well, but in general shielding on pretty much everything from my era was all but non-existent so you may want to take a good look every line when you get to poking around and have a little shielding party.