a number of companies offer a shop air supplied vacuum cooling system filler eg: Snap-on #SVTRAD262 (theirs is a little spendy but the are others more reasonable). There are some oem systems that are more than ugly to purge-early VW Rabbits come to mind, this system WORKS-no starting up, running then cooling down, crossing your fingers etc, it does it in one shot-you won't even spill anti-freeze on the belts then have to fool around trying to get that embarassing noise out