I just installed new A/C compressor (w 4.6 oz of PAG46 oil), , expansion valve and condenser and loaded it with 19 oz of .
It's was 62°F outside and I got 20 psi on low side but on 75 psi on high side when I was expecting about 120psi?
What can be wrong? It blows 38 - 40°F air.

 

The A/C seems to blow nice and cold, so I suspect your pressure readings are wrong.

Did you make the pressure readings with the A/C on and engine idling at 1500 rpm?

 

Thanks, tools is brand new.
When it warmed up I checked it again and all seems to be OK.
Thanks