1993 Pontiac Trans Sport Owner's Manual - Page 201

Problems on the Road A Steam and scalding liquids from a hot cooling system can blow out and burn you badly. They are under pressure,and if you turn the radiator pressurecap-even a little-they can come outat high speed. Never turn the cap when the cooling system, including the radiator pressure cap, is hot. Wait for the cooling system and radiator pressure cap to cool you ever if have to turn the pressure cap. Iow to Add Coolantto the Radiator: If you hear a hiss, wait for that to stop. I You can remove the radiator pressure A hiss means there is still some pressure left. cap when the cooling system, including 2. Then keep turning the pressure cap, the radiator pressure cap upper and but now push down as you turn it. radiator hose, isno longer hot. Turn Remove the pressure cap. the pressure cap slowly to the left until it first stops. (Don't press down while turning the pressure cap.) . . . I 00