Our cars if filled with the factory fitted gas can be expected to lose anywhere between 2% to 10% by weight per year. 35% you have a leek somewhere not just in the veg patch.
The new gas used in all new cars does not mix well with the old CFC gas used in our cars. Most Garages today check AC on a vacuumed check machine all your gas is sucked out and the system test is carried out under vacuum. If the system holds the vacuum the machine fills the system back up with new gas to a given pressure. Not by weight. Good A/C guys are hard to find these days the machines are taking over.
Alan
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