It sounds like a weak compressor to me. That would explain both the weak suction and low discharge pressure. If the system had not been flushed before replacement, no doubt it suffered the same fate. IME, noisy = already compromised the system.

Thanks for the input y'all. It's true we've had like 40 consecutive days over 100. Most over 104. I'm seeing above average pressures on several vehicles lately. A mini cooper today was running at 255-275 with a new system just installed. Cooling at 49 degrees from vents so I can't argue with that. T...

If you're seeing vacuum on the low side or extremely low pressure then you most likely have a bad expansion valve or orifice tube but you really do need to start with a proper, complete metered charge. After a full recovery and vacuum. You may also have a low side hose collapsing but that's rare.

So I'm new to the forum but I've been servicing automotive AC systems for over 20 years. I run a mobile repair business in central Texas and this heat wave is keeping me busy. Anyhow, since I've already run into a few 1234yf systems I invested in dedicated gauges and a recovery machine. I've pretty ...