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A/C System Performance

  1. Park vehicle out of direct sunlight. Install A/C manifold gauge set. Start engine and allow it to run at 1500 RPM. Set A/C controls to outside air, panel (vent) mode, full cold, and A/C button on.
  2. Set blower/fan on high speed and open windows. Operate system for 10 minutes to allow system to stabilize. Insert thermometer in center vent, and measure temperature.
  3. Temperature must be 33-47°F (0.6-8°C) at center vent, with high-side and low-side pressures within specification. See A/C SYSTEM HIGH-SIDE PRESSURE SPECIFICATIONS  table. Low-side pressure remains constant at 25-45 psi (1.8-3.2 kg/cm2 ) throughout normal operating range.
    A/C SYSTEM HIGH-SIDE PRESSURE SPECIFICATIONS

    Ambient Temp. - °F (°C) Pressure - psi (kg/cm2 )
    60 (16) 75-175 (5.3-12.3)
    70 (21) 100-200 (7-14)
    80 (27) 125-230 (8.8-16.2)
    90 (32) 150-260 (10.5-18.3)
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