The volume of refrigerant isn't so much a problem but the evacuation of the system is. To do it properly the system needs to be put into a vacuum to remove air and moisture before it is charged. So if you haven't got access to a refrigeration service vacuum pump you'd be better off taking it some place to have it done.


38 Chevy 1/2 ton being resto-moded
65 AC Cobra replica
USAF vet