Quote:
Originally Posted by oldboxster
great writeup, however, there is one important clarification that needs to be made. The fill amount in the system CANNOT be determined by pressure gauges. This is a two phase system where liquid is present in the receiver dryer and a varying amount of liquid can be present at the same pressure. The pressure reading on the gauges is a function of temperature of the refrigerant and nothing else.
If this were a single phase system,i.e. all gas, then the amount of refrigerant could be inferred by pressure.
Hope this helps
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Hmmm, I'm no AC expert so it appears the Boxster service manual providing low and high side pressures needs to be re-written, as well as the generic AC repair manual I use which shows gauge pressures for underfill, overfill, and a raft of other AC problems.