Originally Posted by
hyperion
if you have created a good vacuum on the system and then charge it using your pre-heated R134A cylinder, your liquid transfer will be quite quick, as the total volume required of most modern cars A/C systems is only about 500grams.
Why is there a need to charge at a fast rate?
As you will have liquid charged, you will need to let the pressures equalise before setting the system in operation.
Only liquid charge into the high side and not into the suction or you could flood the compressor and wash out the oil.