1996 GMC Sonoma Owner's Manual - Page 203
1996 GMC Sonoma Manual
Page 203 highlights
Steam and scalding liquids from a hot cooling system can blow out and burn you badly. They are under pressure, and you turn the radiator if 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, is hot. Wait the cooling systemand for radiator pressure cap to cool if you ever have to turn the pressure cap. -- -- 5-17
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