Refrigerant System Leaks: Notes

WARNING: R-134a service equipment or vehicle A/C system should not be pressure tested or leak tested with compressed air. Mixture of air and R-134a can be combustible at elevated pressures. These mixtures are potentially dangerous and may result in fire or explosion causing property damage and possible serious or fatal injury.

Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and throat. Use only approved service equipment meeting SAE requirements to discharge an R-134a system. If accidental system discharge occurs, ventilate work area before resuming service.

NOTE: If the A/C system refrigerant charge is empty or low, a leak in the A/C system is likely. Visually inspect all A/C lines, fittings and components for an oily residue. Oil residue can be an indicator of an A/C system leak location.

NOTE: The only way to correctly determine if the A/C system is fully charged with refrigerant to perform the A/C Performance Test. See Heating and Air Conditioning - Diagnosis and Testing .

Connect a suitable manifold gauge set and determine if the static A/C system pressure is above or below 345 kPa (50 psi). See Heating and Air Conditioning/Plumbing - Standard Procedure . If less than 345 kPa (50 psi), proceed to SYSTEM EMPTY . If greater than 345 kPa (50 psi), go to SYSTEM LOW .