Leak Test - High-Pressure Side

Operate the A/C system for approx. 10 minutes, then turn the engine off and begin the leak test.

1. Begin at the connection of the high-pressure tube to the evaporator, and work your way along the high-pressure side of the system to the compressor. There are three places to check each tube connection.
2. Check the area:
   • Check the area where the fitting meets the tube.
     Fig 1: Probing Where Fitting Meets Tube For Leaks

     
   • Check the area where the two parts of the fitting join each other.
     Fig 2: Probing Where Two Parts Of Fitting Join Each Other For Leaks

     
   • Check the area where the nut meets the tube.
   Fig 3: Probing Where Nut Meets Tube For Leaks

   
3. Check the area of the pressure switch (dual switch), and also check the seams of the receiver drier.
4. Check the connections of the tubes to the condenser, and also check any welded joints on the condenser.
   CAUTION: An oily area on the fins of the condenser may indicate a leak.
5. Check the area where the hoses attach to the compressor.
6. Check around the machined portions of the compressor (where the compressor sections join each other).
7. If equipped, check the thermal limiter on the compressor housing.
8. Check the compressor shaft seal by probing near the center of the compressor clutch pulley.
   NOTE: Some shaft seals have a very slight amount of normal leakage [approximately 28 g (1.0 oz) per year].