1997 GMC Sonoma Owner's Manual - Page 219
1997 GMC Sonoma Manual
Page 219 highlights
6. Start the engine and let it run until you can feel the upper radiator hose getting hot. Watch out for the engine fan. 7. By this time, the coolant level inside the filler neck may be lower. If the level is lower, add more of the proper DEX-COOL@ coolant mixturethrough the filler neck until the level reaches the base of the filler neck. 8. Then replace the pressure cap. At any time during this procedure if coolant begins to flow out of the filler neck, reinstall the pressure cap. Be sure the arrows on the pressure cap line up like this. 5-21
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