Fluorescent Dye Leak Detection
Fluorescent dye will assist in locating any leaks in the A/C system.
Leaks in the A/C 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:
To prevent false diagnosis in the future, thoroughly clean the residual dye from any area where leaks were found. Use a rag and an approved fluorescent dye cleaner.Halogen Leak Detector
A halogen leak detector is the most useful tool for locating refrigerant leaks. Tool J39400 provides an audible signal which increases in frequency as the unit detects R-134a. Follow the instructions included with the unit in order to properly calibrate the instrument. Use the detector in the proper setting for the type of tested refrigerant. Set the detector gas switch to R-134a prior to use.
The most common leaks occur at the refrigerant fittings or connections. The leaks may be the result of any of the following conditions:
In order to successfully use tool J39400 or any other electronic leak detector, maintain a proper scan rate. Carefully follow the manufacturer's instructions regarding calibration, operation, and maintenance.
During testing, completely circle each joint using the probe at a rate of at 51 mm (1-2 in) per second. Place the tip of the probe less than 6 mm (0.25 in) away from the surface. Do not block the probe tip air intake. A leak exists when the audible tone changes from a steady 1-2 clicks per second to a continuous alarm. Frequently adjust the balance knob in order to maintain the rate of 1-2 clicks per second.
Ensure that the vehicle has at least 0.45 kg (1 lb) of refrigerant in the A/C refrigeration system in order to perform a leak test.
Clean and dry all surfaces in order to prevent a false warning. Liquids will damage the detector.
Use this procedure in order to test the following components:
NOTEFollow a continuous path in order to ensure that you will not miss any possible leaks. Test all areas of the system for leaks.
The evaporator inlet