2003 GMC Sonoma Owner's Manual - Page 296
2003 GMC Sonoma Manual
Page 296 highlights
Cooling System When you decide it's safe to lift the hood, here's what you'll see: A. Coolant Recovery Tank B. Radiator Pressure Cap C. Engine Cooling Fan 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. 5-33
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