Charging A/C System Service 1
PARTIAL CHARGEIf it was not necessary to completely empty the refrigerant system, a partial refrigerant charge can be added to the system.
CAUTION: Review all Safety Precautions and Warnings in the General Information before adding refrigerant to the system. Do not add refrigerant to a system that is known to have a leak.
NOTE: When connecting the service equipment coupling to the line fitting, verify that the valve of the coupling is fully closed. This will reduce the amount of effort required to make the connection. If connection is still difficult to make refer to TSB #24-02-93.
1. Attach manifold gauge set.
2. Set the air conditioning controls to A/C and Low blower speed.
3. Start the engine and allow it to warm up to normal running temperature.
4. If the air conditioning compressor does not engage, disconnect the Dual Pressure Cut Off switch. Place a jumper wire across the terminals in the connector boot. If the compressor still does not engage, a problem exists in the compressor clutch feed circuit.
5. Hold the engine speed at 1400 rpm.
6. While following the instructions provided with the charging equipment being used, charge through the suction side of the system. Add enough refrigerant to clear the sight glass in the filter drier.
7. At the point when the sight glass clears, note the weight of the refrigerant supply drum or the level in the charging cylinder. Add an additional 227 g (8 oz) of refrigerant to the system. Remove the jumper wire from the cut off switch connector and connect the cut off switch.
8. Test the overall performance of the air conditioner. Close all valves on the charging equipment and disconnect the hoses from the service ports. Install the service port caps.
EVACUATION
Before adding refrigerant, all air must be evacuated from the system. Refer to Evacuating Refrigerant system.