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Home >> Subaru >> 2022 >> Forester Wilderness >> 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.
    NOTE: Check that the ambient temperature is 25 - 40°C (77 - 104°F) and that the humidity is 30 - 80%. 
    • Place the vehicle in the shade and windless condition, and open the front hood.
    • Open the front and rear windows and close all doors.
  2. Remove the collector cover. Ref. to INTAKE (INDUCTION) (H4DO)>COLLECTOR COVER>REMOVAL .
  3. 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.
      G14394431Courtesy of SUBARU OF AMERICA, INC.

      Preparation tool: 

      Manifold gauge set

      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 HI (MAX)
    4. In the condition of step (3), idle the engine for 30 minutes.
    5. Read the gauge values on both high pressure side and low pressure side of the manifold gauge.
  4. Measure the air vent grille outlet opening temperature, ambient temperature and humidity.

    Preparation tool: 

    Thermometer and hygrometer

    NOTE: For outlet opening temperature, measure the average temperature of center grille assembly and side grille assembly. 
  5. 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.
    G13226127Courtesy of SUBARU OF AMERICA, INC.
  6. 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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