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Refrigerant Pressure Check

WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the manifold gauge set.
  2. Close the hood.
  3. Warm up the engine and run it at a constant 1,500 rpm. 
  4. Set the fan switch to 4th position.
  5. Turn the A/C switch on.
  6. Set the RECIRCULATE mode.
  7. Set the temperature control to MAX COLD.
  8. Set the VENT mode.
  9. Close all the doors and all the windows.
  10. Measure the ambient temperature and the high-and low-pressure side readings of the manifold gauge.
    • If the high- and low-pressure side readings are in the shaded zone as shown in the figure, the refrigerant system is normal.
    • If the pressure is abnormal, see No.6 of symptom troubleshooting. (See NO.6 AIR FROM VENTS NOT COLD ENOUGH .)
    Fig 1: Ambient Temperature And Manifold Gauge Pressure Reading Graph
    G01914644Courtesy of MAZDA MOTORS CORP.
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