1996 GMC Sonoma Owner's Manual - Page 204

1996 GMC Sonoma Manual

Page 204 highlights

How to Add Coolant to the Ra 2. Then keep turning the pressure cap, but now push down as you turn it. Remove the pressure cap. I . Youcan remove the radiator pressure cap when the cooling system. including the radiator pressure cap and upper radiator hose, is 110longer hot. Turn the pressure cap slowly counterclockwiseuntil it first stops. (Don't press down while tu1-nin2 the pressurecap.) If you hear a hiss, wait for that to stop. A hiss means there is still some pressure left. 5-18

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