AC–3 AIR CONDITIONING SYSTEM – GENERAL DESCRIPTION O-Ring Seal O-Ring Lip Seal and Ring N04183 3. USE OF PROPER O–RINGS AND SEALS O–rings and seals used for conventional CFC12 air conditioning systems cannot be used for HFC134a air conditioning systems. Always use genuine Toyota HFC134a system O–rings and seals for HFC134a air conditioning systems. Gas (HFC 134a) Leakage CFC12 O-Ring (foaming and swelling) N04141 Z12957 If O–rings and/or seals for CFC12 air conditioning systems are used by mistake in the connections of an HFC134a air conditioning system, the O–ring and seals will foam and swell resulting in leakage of refrigerant. Compressor Oil ND-OIL8 N04510 4. TIGHTEN CONNECTING PARTS SECURELY Securely tighten the connecting parts to prevent leaking of refrigerant gas. • Apply a few drops of compressor oil to O–ring fittings for easy tightening and to prevent leaking of refrigerant gas. CAUTION: Apply only ND–OIL 8 compressor oil. • Tighten the nuts using 2 wrenches to avoid twisting the tube. AC1608 • Tighten the O–ring fittings or the bolted type fittings to the specified torque. 5. INSERT PLUG IMMEDIATELY IN DISCONNECTED PARTS Insert a plug immediately in the disconnected parts to prevent the ingress of moisture and dust. 6. DO NOT REMOVE PLUG FROM NEW PARTS UNTIL IMMEDIATELY BEFORE INSTALLATION N04326 7. DISCHARGE GAS IN NEW COMPRESSOR FROM CHARGING VALVE BEFORE INSTALLING IT If the gas in the new compressor is not discharged first, compressor oil will spray out with gas when the plug is removed.