Leak Tests

Special Tools:

Special Tools

ELECTRONIC LEAK DETECTOR

WARNING: GOOD VENTILATION IS NECESSARY IN THE AREA WHERE A/C LEAK TESTING IS TO BE PERFORMED. IF THE SURROUNDING AIR IS CONTAMINATED WITH REFRIGERANT GAS, THE LEAK DETECTOR WILL INDICATE THIS GAS ALL THE TIME. ODORS FROM OTHER CHEMICALS SUCH AS ANTI-FREEZE, DIESEL FUEL, DISC BRAKE CLEANER, OR OTHER CLEANING SOLVENTS CAN CAUSE THE SAME PROBLEM. A FAN, EVEN IN A WELL VENTILATED AREA, IS VERY HELPFUL IN REMOVING SMALL TRACES OF CONTAMINATION FROM THE AIR THAT MIGHT AFFECT THE LEAK DETECTOR.





1. Attach R-134a Manifold Gauge Set 176-R032A or equivalent to the service gauge port valves.
^ Leave both manifold gauge set valves closed.
^ Both gauges should indicate 413-551 kPa (60-80 psi) at 24° C (75° F) with the engine off.
^ If little or no pressure is indicated, charge the refrigerant system.





2. Leak test the refrigerant system using R-134a Automatic Calibration Halogen Leak Detector 023-R1003 or equivalent. Follow the instructions included with the leak detector for handling and operation techniques.





3. If a leak is found, recover the refrigerant and service the system. Discharging and Recovery

LEAK TRACER DYE

NOTE: Ford Motor Company now produces vehicles with R134a Leak Tracer Dye incorporated into the A/C system. The exact location of leaks can be pinpointed by the bright yellow-green glow of the tracer dye. Since more than one leak may exist, always inspect each component.





1. Check for leaks using 120 Watt UV Lamp 164-R0721 or equivalent.
2. Scan all components, fittings, and lines of the A/C system.
3. After the leak is repaired, remove any traces of leak dye with a general purpose oil solvent.





4. Verify the repair by operating the system for a short time and inspecting with the UV lamp.