Hello, A friend of myne was kind enough to let me use his 30lb tank of R-12. My car sat untouched for 15 years so I am guessing the freon leaked out over that time. The low pressure switch is tripped so I know there must be very little freon in the system. I am bringing my car in on Friday morning to have it evacuated and recharged. Are there any parts I should have replaced at this time? or just see if it will hold a charge? Please let me know ASAP so I can next day air them if I need them. Thanks David #6286