PO tossed the ball reservoir when he added the "killer thump system, with HUUUUGE battery cables", but i found one at the local u-pull and installed it, before crafting one from PVC.

Still had the issue, no change. I guess check/change all the lines under the hood first, coming back from the reservoir?

Are any of the regulators more problem prone than the other?

A/C is ICE cold in this XJ, with little heat issues so far, so I want to try and make this thing work.