CONNECTING LINES & FITTINGS
A new "O" ring should be used in all instances when connecting lines and fittings (dip "O" ring in clean refrigeration oil and make certain it is not twisted during installation). Always use two wrenches to avoid twisting or distorting lines and fittings, tighten coupling nuts securely.
PLACING SYSTEM IN OPERATION
After component replacement and/or system servicing has been completed and all connections have been made, proceed as follows
- Evacuate the system using a vacuum pump.
- Charge the system with new R-12 (refrigerant) according to each individual vehicle manufacturers procedure as outlined in this Manual. Also see Refrigerant Capacity in this Section.
- Leak test the system, with particular attention to all new connections and components.
- Make a performance test of the system.
COMPRESSOR ISOLATION METHOD
On systems which have compressors equipped with stem-type service valves (York and some Tecumseh), it is possible to isolate the compressor for removal.
COMPRESSOR DISCHARGE METHOD
This procedure is to be used on vehicles which have compressor equipped with Schrader service valves. In these cases, the compressor cannot be isolated and the system must be discharged using approved refrigerant recovery/recycling equipment prior to compressor removal.
Removal (General Motors "C", "K" & "S")
Discharge system using approved refrigerant recovery/recycling equipment. Remove connector attaching bolt. Remove connector and cap openings. Disconnect wiring to clutch actuating coil. Remove drive belt. Remove compressor mounting brackets and compressor. Drain and measure oil in compressor.
Installation (General Motors "C", "K" & "S")
Replace oil in compressor with exact amount drained. Reverse removal procedures, installing new "O" rings on connector. Evacuate and charge system. Check operation.
Removal (General Motors "G" Models)
- Disconnect battery ground cable and compressor clutch connector. Purge system of refrigerant. Remove drive belt.
- Remove 2 bolts and 2 clamps holding engine cover and remove engine cover. Remove air cleaner, fitting and muffler assembly. Cap openings.
- Remove compressor-to-bracket bolts. Remove engine oil tube support bracket bolt and nut from compressor. Remove clutch ground wire and remove compressor. Drain and measure oil in compressor.
Installation (General Motors "G" Models)
Replace oil in compressor with same amount as that removed. Reverse removal procedures, installing new "O" rings on connectors. Evacuate and charge system.