Refrigerant System Leak

If A/C system is not cooling properly, determine if refrigerant system is fully charged with R-134a. This is accomplished by performing a system Performance Test. If while performing this test A/C liquid line pressure is less than 345 kPa (50 psi) proceed to Refrigerant System Empty. If liquid line pressure is greater than 345 kPa (50 psi) proceed to Refrigerant System Low. If refrigerant system is empty or low a leak at a line fitting or component seal is likely. Check the fittings, lines and components for oily residue, this is an indication of a leak.