Fluorescent Leak Detector
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Always use UV protective eyewear when working with UV light.
Fluorescent dye will assist in locating any leaks in the air conditioning system.
- Condensation on the evaporator core or the refrigerant lines may wash the air conditioning oil and fluorescent dye away from the actual leak. Condensation may also carry dye through the HVAC module drain.
- Leaks in the air conditioning system will be indicated in a light green or yellow color when using the leak detection lamp.
Use the leak detection lamp in the following areas:
- All fittings or connections that use seal washers or O-rings
- All of the air conditioning components
- The air conditioning compressor shaft seal
- The air conditioning hoses and pressure switches
- The HVAC module drain tube, if the evaporator core is suspected of leaking
- The service port sealing caps
The sealing cap is the primary seal for the service ports.
- Follow the instructions supplied with the GE-42220 leak detection lamp.
- To prevent false diagnosis in the future, thoroughly clean the residual dye from any area where leaks were found. Use a rag and the approved GE-43872 dye cleaner.
NOTE:
Air conditioning oil is water soluble.