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By the way you charge a system by the weight of the freon.
A system that takes 3 1/2 pounds will take 3 16oz cans and a half of a 12oz can.

When I retrofitted my system I followed the directions that came w/the kit, and used 80% of the 3.5lbs. However w/the Maxi-frig it was the same amount as w/the R12.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed