2003 GMC Yukon Owner's Manual - Page 390
2003 GMC Yukon Manual
Page 390 highlights
Cooling System When you decide it's safe to lift the hood, here's what you'll see: All Other Engines A. Coolant Surge Tank B. Coolant Surge Tank Pressure Cap C. Engine Fan If the coolant inside the coolant surge tank is boiling, don't do anything else until it cools down. The vehicle should be parked on a level surface. 8100 V8 Engines 5-32
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