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Home >> Subaru >> 2023 >> WRX GT >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System (Heater, Ventilator And A/C) >> Refrigerant Pressure with Manifold Gauge Set >> Procedure >> Check Refrigerant Gas Pressure

Check Refrigerant Gas Pressure

  1. Prepare the vehicle.
    • Place the vehicle in the shade and windless condition, and open the front hood.
    • Open the front and rear windows and close all doors.
    • Check that the ambient temperature is 25 - 40°C (77 - 104°F) and that the humidity is 30 - 80 %.
  2. Check the refrigerant pressure.
    1. Attach the manifold gauge set.
      CAUTION:
      • During operation, be sure to wear protective goggles and protective gloves.
      • Follow the detailed operation procedure described in the attached operation manual.
      G16341561Courtesy of SUBARU OF AMERICA, INC.
      1 Manifold gauge
      2 Low pressure valve
      3 Center valve
      4 High pressure valve
      5 Low-pressure hose
      6 Center manifold hose (vacuum pump and charge)
      7 High-pressure hose
      8 Low-pressure side service port
      9 High-pressure side service port
      1. Check that all valves are fully closed.
      2. Install the low/high pressure hoses to the service ports on the low/high pressure sides of the vehicle respectively.
        CAUTION: Confirm that the connections are secure.
    2. Start the engine.
    3. Set the vehicle to the following conditions.
      Item Condition
      Engine Warming-up
      Air vent grille Full open
      A/C switch ON
      Temperature setting LO (MAX COOL)
      FRESH/RECIRC position RECIRC
      Air flow control position VENT
      Fan speed 5/7 level
    4. Idle the engine for 30 minutes under the conditions in step (3).
    5. Read the gauge values on both high pressure side and low pressure side of the manifold gauge.
  3. Using a thermometer and a hygrometer, measure the air vent grille outlet opening temperature, ambient temperature and humidity.
    NOTE: For outlet opening temperature, measure the average temperature of center grille assembly and side grille assembly.
  4. Check that the high and low pressures and outlet opening temperature for ambient temperature and humidity is within the standard value described in the chart below.
    G14612084Courtesy of SUBARU OF AMERICA, INC.
  5. Refer to "DIAGNOSIS WITH SYMPTOM" if the inspection result is not within the standard value. Ref. to AIR CONDITIONER>REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET>INSPECTION>INSPECTION WITH PRESSURE SYMPTOM .
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