How to Add Refrigerant to a 1992 Cutlass Supreme
- 1). Turn the engine off, and set the air conditioning controls to "Max A/C" and medium blower speed. The service valves in the 1992 Cutlass Supreme are located on the refrigerant lines below the air filter housing. Use a screwdriver, 10 mm socket and socket wrench to remove the air filter housing and set it aside. Attach the red and blue hoses from the A/C gauge set to the fittings located under the housing. Temporarily reattach the air filter housing.
- 2). Start the engine and allow it to run for a few minutes. Insert a can of refrigerant into the can tap on the remaining hose on the A/C gauges. Lock the can in place with the thumb lever on the side of the tap, and screw the thumb screw on top of the tap all the way in and out to open the can. With the engine running, open the blue valve on the A/C gauge assembly to allow the refrigerant to flow into the system. When the can is empty, close the valve and allow the pressures displayed on the gauge set to stabilize for a few seconds. Add additional refrigerant until the pressures are between 35 and 40 psi on the blue gauge, and 250 and 350 psi on the red gauge.
- 3). Turn the engine off and disconnect the gauge set from the service valves. Reinstall the air filter housing and test-drive to verify that the air conditioning system works properly.
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