2. Performance check - Start engine, engage A/C, operate for 10 minutes at 1500 rpm, on
maximum cooling and highest fan speed, insert thermometer probe into the center vent and
connect R12 pressure gauges. If required add sufficient R12 refrigerant (if available) to bring
the A/C system pressures and center vent temperatures to the manufacturers specifications.
Take note of the pressure and temperature readings.
(NOTE: RUNNING THE A/C SYSTEM FOR 10 MINS ETC. WILL ENSURE THAT MOST OF
THE MINERAL OIL WILL BE TRAPPED IN THE COMPRESSOR