Fluid Leak Detectors

Leak-Testing the Refrigerant System
Test for leaks whenever a refrigerant leak is suspected and when performing a service operation which disturbs lines or connections. Testing the refrigerant system for leaks is one of the most important phases of troubleshooting. One or more of the methods outlined will prove useful in detecting leaks or checking connections if service work is performed. Before beginning any leak test, attach a manifold gauge set and note pressure. If little or no pressure is indicated, a partial charge must be installed. Check all connections, compressor head gasket, oil filler plug and compressor shaft seal for leaks.

Liquid Leak Detectors
There are a number of locations (fittings, valves, etc.) on the air conditioning system where a liquid leak detector solution may be used to pinpoint refrigerant leaks. When the test solution is applied to the suspected area (using the swab attached to the bottle cap) bubbles will form within seconds if there is a leak. For areas with restricted access (such as sections of the evaporator and condenser) an electronic leak detector is more practical for determining and locating leaks.