A/C not working right

Hello,

my whole A/C was raplaced last year (compressor, orifice, accumulator..), but since a few days when I turn it on it takes about 5 min to get some cold air out of it and it is even not really cold.

Does someone have any idea what this can be?

Thank you

Low system pressure? Faulty circuitry that engages the compressor?

Connect some gauges, find out the pressures.

Good idea, I think i have to do this in a shop. Hopefully it isn't that expensive.