Refrigerant Pressure Check

WARNING: This page is about a different car, the 2016 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

Install the manifold gauge set. (See MANIFOLD GAUGE SET CONNECTION .)
Start the engine and warm it up.
Prepare the vehicle as follows.
- Airflow volume: MAX HI
- A/C switch: ON
- Air intake port: REC
- Airflow temperature: MAX COLD
- Airflow mode: VENT
- Hood: Open
- All the doors and the trunk: Close
- All the windows: Close
- Engine speed: 1, 500 rpm
Verify the pressure indicated on the manifold gauge and ambient temperature.
NOTE:
- Measure the refrigerant pressure after approx. 10 min have elapsed from engine start.
Verify that there are high/low pressure value readings within the shaded areas of the figure.

Fig 1: Refrigerant Temperature/Pressure Graph
Courtesy of MAZDA MOTORS CORP.
- If not as verified, inspect the refrigerant system according to the troubleshooting chart. (See FOREWORD [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)] .) (See FOREWORD [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)] .)