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HOMESERVICE MANUALSCHEVROLET1992CAVALIER RS, 2D CONVERTIBLE, 2.2 4, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)GENERAL SERVICINGA/C SYSTEM GENERAL SERVICINGEXPANSION OR "H" VALVE STUCK CLOSEDTESTING
1992 Chevrolet Cavalier RS, 2D Convertible, 2.2 4, Standard

Expansion Or "H" Valve Stuck Closed: Testing

1992 Chevrolet Cavalier RS, 2D Convertible, 2.2 4, StandardSECTION Testing
  1. If evaporator inlet is cool to touch, proceed as follows:
    1. Set air conditioner for maximum cooling and operate the system.
    2. Spray liquid R-12 on head of valve or capillary tube if equipped). Note low side gauge reading. Low side gauge should drop into a vacuum.
    3. If low side vacuum reading was obtained, warm expansion valve diaphragm chamber with hand, then repeat test step b.).
    4. If expansion valve test indicates valve operation is satisfactory, clean contact surface of evaporator outlet pipe and temperature sensing bulb. Make sure bulb is securely in contact with pipe.
    5. If expansion valve test indicates the valve is defective, discharge the system, using approved refrigerant recovery/recycling equipment. Replace expansion valve, and proceed with correction procedure.
  2. If expansion valve inlet shows sweating or frost proceed as follows:
    1. Discharge system using approved refrigerant recovery/recycling equipment.
    2. Disconnect inlet line at expansion valve. Remove and inspect screen.
    3. Clean and replace screen and reconnect inlet line.
    4. Proceed with correction procedure.
Fig 1: Expansion or "H" Valve Stuck Closed Gauge Indications
G104006
RENDER: 1.0x

NO RELATED

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