Just quickly, pressure readings do not tell you charge level, but I agree throwing in one can like that --if you know for sure low can fix it. If it is not low you can overcharge , = disaster . The only way to correctly charge is by weight of refrigerant and a scale -which they do in an empty system or first pull out what is in there with suction AC machine ( a law now) . Excess liquid refrigerant is kept in the car receiver / dryer tank , by design .
It is like a propane tank . Pressure is the same almost empty or full . Pressure is Set only by temp of propane ,or refrigerant not by how much is in tank .. for things that are liquid at room temp under pressure , but change to gas if pressure drops . Why gas comes out in your grill , not liquid . And flame stays about the same size ( same pressure) as the liquid tank empties on a hand held propane torch . And gets cold. Straight compressed gas ( oxygen) non liquified yes pressure tells you % full in cu ft .
Somewhere in FSM is weight in oz of new charge .. about 2 cans + usually. By way of understanding , not critique .
Sent from my iPhone
On Aug 24, 2017, at 5:08 PM, Ray Jones 1970hurst@xxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:
Posted by: John Grady <jkg@xxxxxxxxxxxxxxxxx>
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