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Probably not. Compressors don't fail that way. They don't lose performance by any significant amount.
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I hope your right.
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Things that effect performance beyond incorrect charge amount are dirty condensor, dirty evaporator, too much oil in system, bad aux fan or controls, bad viscous clutch AND don't forget that the climate control controls the flow of coolant through the heater core to regulate temperature.
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I've cleaned the condenser with soap and water, and fixed the aux fans so they run properly. The ccu does turn them on but only after the high side pressure is over ~15bar. I don't think they evap is very dirty since this system has filters on the air inlet. The viscous fan is working well and keeping the engine just below 80C most of the time. I have cleaned the duo-valve and the heater core temps are only 2 to 4 degrees higher then the evap temp, so I can assume little to no coolant is getting by the valve.
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All that said, if you are taking these pressures and readings with the car sitting still, then they will vary. The key is enough air flow across the condensor. Driving down the road, this is no problem in most cases. In the shop with gauges and thermometers in place OTOH unless you have a high flow shop fan in front of the radiator and the idle set to about 1,500 RPM, it's difficult to check pressures and temps.
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The low side pressure was taken with the car was stationary, but with varying rpm and cooling fan speeds. The evap temp and highside pressure were taken multiple times on a 8 hour drive. The outside temp varied from 68-85F with no change in evap temp and only minor increase in highside pressure from 7-9bar.