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Fix the leaks first - R12 is too expensive and too unfriendly to the environment to let it escape. There is a procedure in the archieves to put in 2 oz of R22 and then pressurize with nitrogen to find the leaks.
Q. If you evacuate the system, can't you add the required amount of R12 by weight with the car not running? After the required amount is added, do you still need to jump the switch? I thought it would then kick in with the right charge.
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