S10/T10 Blazer 4WD V6-262 4.3L (1989)
Refrigerant: Service and Repair
Evacuation Procedures
Available Methods
EVACUATING AND CHARGING
Before charging, evacuate the system if Refrigerant-12 is lost or if the system has been opened.
Evacuation and charging is a combined procedure. Purge all gage lines with Refrigerant-12 before charging.
There are three standard Refrigerant-12 evacuate and charge procedures:
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J 23500-01 Charging Station Method
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Drum Method
NOTICE: Do not use alcohol to remove moisture from the system. Alcohol can damage components.
Charging Station Method
CHARGING STATION METHOD
Tool Required:
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J 23500-01 Portable Charging Station
Follow the J 23500-01 Charging Station instructions. Use with the following exceptions:
1. Do not connect the high pressure line to the air conditioning system.
2. Keep the high pressure valve on the charging station closed.
3. Perform the evacuation and charging procedure through the accumulator low side pressure service fitting.
4. Following these procedures will prevent high-side pressure from damaging the charging station if an error is made during the sequence.
Refrigerant Drum Method
Charging the System
REFRIGERANT DRUM METHOD
A. The evacuation procedure will specify 711-737 mm (28- to 29-inches) of mercury at sea level. For each 304.8 mm (1,000 ft.) above sea level,
lower the specifications 25.4 mm (one inch) of vacuum. At 1,524 mm (5,000 feet) of elevation only 584.2-609.6 mm (23- to 24-inches) of
mercury (vacuum) is required.
B. If the prescribed (vacuum) cannot be reached, close the vacuum control valve, shut off the pump and look for a leak at the connections or the
pump.
3. When the gage reaches the prescribed vacuum, the system is evacuated. Close the high side gage set valve and turn OFF the vacuum pump.