air con help please

[alex6666]

2017 tradesman 78kkm. When i bought the truck at 44kkm the air con was extremely weak. I had it serviced and topped up with a/c coolant. Temporary minor improvement. This spring no a/c. Service guy says the compressor did not appear working probably cuz the coolant was low/empty. I'm guessing there is a coolant leak somewhere.....anyone have a similar problem that might know if/where that leak might occur? TIA for your replies

 

[jws123]

Have someone de charge replace the schrader valves re fill system with refrigerant dye and when it leaks out again you will find the leak with a uv light.