'Sorry, but you don't need a vacuum pump. If you have good gauges,
hooked up to the right ports, know the ambient air temp., and how much
charge the system is supposed to have, you can fill the system properly
without a problem.
REPLY: If the system is totally empty, you WILL need a vaccuum pump to
rid the system of air and moisture and do it correctly. Further, you
dont 'fill' an auto a/c system (to the top) ; it has to be accurately
metered in and depends on a variety of factors . You will NOT know how
much freon to put in unless you weigh in the EXACT amount which requires
a Charging Cylinder that is marked off in lbs and ounce increments ..
which requires you to know how to use it properly ; if y ou just add
freon from a store bought kit , you are only guessing . If youre a
consumer, stay away from touching your a/c system except to power wash
your Condensor Coil routinely.