BLOCK-HYDRAULIC 3236856 - Caterpillar

The air conditioning system is under pressure at all times, engine running or not. Heat must never be put on a charged system. This system is charged with refrigerant-12 (CCL2F2 Dichlorodifluoromethane) which is not toxic or flammable. But there is reason for warning, when refrigerant-12 makes contact with a flame, lethal phosgene gas is made. To inhale refrigerant through a lighted cigarette can cause violent illness. To prevent possible personal injury, always wear goggles and do not smoke when air conditioning system is open.
1. Release refrigerant-12 from the system. See Air Conditioning And Heating, Purging The System, FORM No. SENR3334-01 or SENR5664. 2. Disconnect two hose assemblies (1) from the core. 3. Fasten a hoist to the core (3). Remove four bolts (2). Remove core (3).4. Put core (3) in position in the radiator and install the four bolts (2) that hold it.5. Connect the two hose assemblies (1).End By:a. install Fan