Leak Testing

Operate system to stabilize high and low side pressures. Turn engine off. Using an R-12 leak detector, check all refrigerant line connections for leaks. Check compressor seal area and condenser. R-12 is heavier than air. Always check for leaks at bottom of refrigerant lines and components. Refrigerant oil will leak with R-12. Visually check all connections and compressor clutch area for oil stains. If compressor shaft seal is leaking, a fresh oil streak will normally be seen on underside of hood above compressor clutch.

Always perform leak testing after A/C service. Move R-12 leak detector slowly to check for leaks, as leaks will not be detected if leak testing is performed too quickly.