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Another tip. While charging place the can in hot water. Don't keep the can closed long as you'll be building vapor pressure fairly quickly. A lot of times you'll have a difficult time getting the compressor to stay on while charging due to the low pressure switch. If you keep the can pressure higher you can force vapor and keep suction side pressure up preventing it from going off on low pressure. As long as you still have refrigerant you can add without placing the system in a vacuum. If you're replacing a component absolutely put the system in a vacuum. I charge by vent temp and I look for condensation to build on the suction line at the accumulator. Make sure you have the system turned on Max AC with your fan on high while charging.
Something to keep in mind. If you overcharge you'll actually see your vent temps starting to rise when you add refrigerant rather than go lower.
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