I've got a 91 5.0 that I'm replacing the original AC system except the evaporator. A couple days ago I used a can of ac flush on it. I've used compressed air half a dozen times and I'm still getting flush liquid out. Not much but still some.
How dry does it have to be before I can trust that the vacuum pump will boil the rest out?
How dry does it have to be before I can trust that the vacuum pump will boil the rest out?