1. Install the SSTs (gas charging set).
2. Warm up the engine and run it at a constant 1,500 rpm.
3. Set the fan speed to MAX HI.
4. Turn the A/C switch on.
5. Set the RECIRCULATE mode.
6. Set the temperature control to MAX COLD.
7. Set the VENT mode.
8. Close all the doors and all the windows.
9. Measure the ambient temperature and the high- and low-pressure side reading of the SST (49 C061 001).
10. Verify that the intersection of the pressure reading of the SST (49 C061 001) and ambient temperature is in the shaded zone.