Did you try to hook up a different solenoid? They are only held in by one screw. Just move one of them over so the center vent connections will fit. I had a problem with one of the solenoids a year or so ago, it was sucking air from the bottom..I just put some gum or something to plug the hole that was leaking.

After that, I would check the pins on the connections (wire side) that attach to the ACC.

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My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior