2006 GMC Savana Van Owner's Manual - Page 274

Cooling System If your vehicle has a diesel engine, see "Van Models" under "Cooling System" in the DURAMAX® Diesel Supplement. When you decide it is safe to lift the hood, here is what you will see: If the coolant inside the coolant recovery tank is boiling, do not do anything else until it cools down. When the engine is cold, the coolant level should be at or above the COLD FILL mark. If it is not, you may have a leak at the pressure cap or in the radiator hoses, heater hoses, radiator, water pump, or somewhere else in the cooling system. A. Radiator Pressure Cap B. Coolant Recovery Tank C. Engine Cooling Fan(s) 5-26