Partial A/C System Charge

NOTE: After all leaks have been corrected and if it was not necessary to completely discharge the refrigerant system, a partial refrigerant charge can be added to the system. To add a partial refrigerant charge,

CAUTION: Review all Precautions and Warnings.

1. Remove the caps from the discharge (high pressure) and suction (low pressure) service ports.
2. Connect a suitable charging station or manifold gauge set to the service ports.
3. Open the windows of the passenger compartment and set the air-conditioning control to A/C, RECIRC, and Low blower.
4. Start the engine and allow to warm up to normal running temperature.
5. If the air-conditioning compressor does not engage, disconnect the low pressure cut-off switch and with a suitable jumper wire, jump across the terminals in the connector boot If the compressor still does not engage, a problem exists in the compressor clutch feed circuit.
6. Hold the engine speed at 1400 rpm.
7. While following the instructions provided with the equipment being used, charge through the suction side of the system enough refrigerant to clear the sight glass in the filter drier.
8. At the point when the sight glass clears, note the weight of the refrigerant supply drum or the level in the charging cylinder and add an additional 340 g (12 oz) of refrigerant. Remove the jumper wire from the low pressure cut-off switch connector and connect the cut-off switch.
9. Test the over all 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.