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Refrigerant Pressure Check

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the manifold gauge set. (See MANIFOLD GAUGE SET INSTALLATION .)
  2. Open the hood.
  3. Close all the doors and all the windows.
  4. Warm up the engine and run it at a constant 1,500 RPM. 
  5. Turn the A/C switch on.
  6. Set the fan switch to 4th speed.
  7. Set the REC/FRESH lever to REC.
  8. Set the mode dial to VENT.
  9. Set the temperature control dial to MAX COLD.
  10. Measure the high- and low-pressure side readings of the manifold gauge.
    • If the high- and low-pressure side readings are in the shaded zones as shown in the figure, the refrigerant system is normal.
    • If the high- and low-pressure side readings are not as specified, troubleshoot the refrigerant system. (See FOREWORD .)
      Fig 1: Refrigerant Pressure Check Chart
      G03638528Courtesy of MAZDA MOTORS CORP.
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