1998 GMC Suburban Owner's Manual - Page 269

1998 GMC Suburban Manual

Page 269 highlights

How to Add Coolant to the Radiator 2. Then keep turning the pressure cap, but now push down as you turn it. Remove the pressure cap. 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 ahiss, wait for that to stop. A hiss means there is still some pressure left. 5-19

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