How will you know how much freon your car needs?
first read up on it then read the gauge... theres a cool new kit
called "A/C recharging for dummies" at the parts store.. also
Everyone should have a manual for their vehicle, and the library
should have a professional shop manual available, for FREE, in the
reference section(make copies of the correct sections) read up and
fix it like a PRO! :) good luck-Dave