If you're using dry nitrogen, pressurize the whole system to ~200 PSI and look for it to drop. Dry nitrogen does not change pressure with temperature, so a pressure change positively identifies a leak.

35 PSI won't tell you a thing about anything. The high side of the system will easily get up to 300+PSI in hot weather with the compressor running.

You can't independently pressurize the low and high sides, they will equalize through the compressor and the expansion valve. You need to pressurize the entire system and watch it as a system.

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Current stable:
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1983 500SL 120K (SLoL)

Black Sheep:
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