Special tool
 | UV lamp 120W or equivalent |
 | R-134a refrigerant gauge kit or equivalent |
 | Fluorescent dye injector for R-134a refrigerant |
NOTE: Vehicles manufactured from 07.1999 have an air conditioning system (A/C) fluorescent indicator dye tablet. If indicator dye is present, there is a green cross on the suction hopper.
NOTE: For vehicles built up to 07.1999, an indicator dye must be added.
1. Using the dye injector, add 7.4 ml of fluorescent indicator dye.
NOTE: Some vehicles may have traces of coolant oil on spring-loaded couplings. This may be because it was used to ease the installation process. If leakage is suspected at the spring-lock coupling, always wipe the connection clean and check it with an automatically calibrated halogen leak detector for the R134a system (R-134a Automatic Calibration Halogen Leak Detector).
NOTE: The exact location of leaks can be pinpointed by the bright yellow-green glow of the indicator dye. Because there may be more than one leak, each element should always be inspected.
2. Check for leaks using a 120W UV test lamp. All elements, fittings and lines of the A/C system should always be checked.
3. After the leak is found and repaired, remove all traces of dye using a general purpose solvent.
4. Check the quality of the repair by turning the system on for a few minutes and re-inspecting it using an ultraviolet lamp.
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