2003 Chevrolet Blazer Owner's Manual - Page 295
2003 Chevrolet Blazer Manual
Page 295 highlights
How to Add Coolant to the Radiator Steam and scalding liquids from a hot cooling system can blow out andburn you badly. They are under pressure, and if you turn the radiator pressure cap even a little-- they can come out at high speed. Never turn the cap when the cooling system, including the radiator pressure cap, i s hot. Wait for the cooling system and radiator pressure cap to cool if you ever have to turn the pressurecap. -- 1. You can remove the radiator pressure cap when the cooling system, including the radiator pressure cap and upper radiator hose, is no longer hot. Turn the pressure cap slowly counterclockwise until it first stops. (Don't press down while turning the pressure cap.) If you hear a hiss, wait for that to stop. A hiss means there is still some pressure left. 5-32
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