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I've always used working air dryers from parts trucks, so they bolt right up. The biggest weakness with the air dryers is they don't like long periods of inactivity. All the more reason to drive your truck more often. Glad it all worked out

You can still do all those upgrades this weekend. The air dryer replacement takes about an hour. There's a thread on here about fan actuator rebuild. Not sure on the time for that one but none of it will preclude the other upgrades and PMs.

Could be the air dryer expello valve sticking open. It's the dump valve on the bottom of the unit. Try to pull it closed with some pliers and see if you can work it up and down. A picture of the other air leak would help. Sounds like fan actuator valve. In the picture below there is a black...