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What is a parallel condenser? Did you mean to say serpentine? Did you account for the oil shipped in the compressor before topping off the oil? What are the high side and low side pressures? What is the ambient temperature? What is the center outlet nozzle temperature on high blower at ~2,000 engine RPM? Did you try flushing the condenser? What is the condition of the condenser and radiator fins? Is airflow through the condenser/radiator obstructed (e.g., smashed fins, bugs, birds, rodent midden, dirt or other debris)? Is the fan clutch operating correctly? Are the drive belts adjusted correctly?
With gauges connected, engine running at ~2,000 RPM, thermometer in the center outlet nozzle, doors/windows closed, blower on high, and A/C on MAX, spray water from a garden hose across the condenser. Allow the system pressures and outlet temperature to stabilize. Continue spraying the condenser with water. What do the system pressures and thermometer measure? Use the chart below for comparison. Knowing the relative humidity is important.
Quote from: bd on July 29, 2019, 09:23:48 AMWith gauges connected, engine running at ~2,000 RPM, thermometer in the center outlet nozzle, doors/windows closed, blower on high, and A/C on MAX, spray water from a garden hose across the condenser. Allow the system pressures and outlet temperature to stabilize. Continue spraying the condenser with water. What do the system pressures and thermometer measure? Use the chart below for comparison. Knowing the relative humidity is important.You need to perform this ^^^^^ to continue. Also, see the chart below in reference to your stated parameters. This is what you should anticipate according to GM for your year/model vehicle.