1993 Chevrolet Lumina Owner's Manual - Page 179

1. You can removethe radiator pressure You can be burnedif you cap when the cooling system, spill coolant on hot engine including the radiator pressure cap parts. Coolant contains ethylene and upper radiator hose, is no longer glycol and itwill burn if the engine hot. Turn the pressure cap slowly to parts are hot enough. Don't spill the left until.it first stops. (Don't engine. coolant on a hot press down while turning the pressure cap.) 2. Then keep turning the pressure cap, If you hear a hiss, wait forthat to but now push down as you turn it. stop. A hiss meansthere is still some Remove the pressure cap. pressure left. I 11 I 3. After the lengine cools, openthe coolant air bleed valve or valves. 2 2 L4 (VINCODE 4): There is .L only one bleed valve. is located on It the coolant outlet adapter.