2004 GMC Envoy Owner's Manual - Page 342

2004 GMC Envoy Manual

Page 342 highlights

How to Add Coolant to the Radiator 2. Then keep turning the pressure cap. 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 about one full turn. If you hear a hiss, wait for that to stop. A hiss means there is still some pressure left. 5-34

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