2004 GMC Sonoma Owner's Manual - Page 272
2004 GMC Sonoma Manual
Page 272 highlights
Cooling System When you decide it's safe to lift the hood, here's what you'll see: If the coolant inside the coolant recovery tank is boiling, don't do anything else until it cools down. The vehicle should be parked on a level surface. A. Coolant Recovery Tank B. Radiator Pressure Cap C. Engine Cooling Fan 5-28
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