Measuring Subcooling

[coolmanuk]

How am i supposed to measure the subcooling on a split AC. I only have 2 service points, no liquid point the TEV is in outdoor unit and service point isafter TEV

[monkey spanners]

If its a mini split you don't measure the subcooling, you charge by weight using the formula and chart in the install instructions.
Otherwise there is often another shrader inside the unit for measuring high side pressure.

[The Viking]

Alternatively, if it's a heatpump, run it in heating mode and you will get your liquid line port.

But as MS says, best is to weigh it in.