With equipment normally available you can't pull too much vacuum. However, you need to pull close to 20 inches to get all the moisture out. Need to run pump and hold vacuum for a half hour. Harold McElraft - 3354 --- In dmcnews@xxxxxxxxxxxxxxx, john fredt <hecklerkochgmbh@xxxx> wrote: > > I need some help with evacuating the air conditioning system.Does anyone know how many cfm to bring it down too? My pump can pull 5 cfm but im sure thats way more than necessary.Im not certified for air conditioning work so I dont know.Can to much vacuum damage the deloreans ac system? It seems to much would cause the seals to fail.Isnt that correct? > > > > thanks guys