2007 GMC Savana Van Owner's Manual - Page 312

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. Notice: Engine damage from running your engine without coolant is not covered by your warranty. Notice: Using coolant other than DEX-COOL® may cause premature engine, heater core, or radiator corrosion. In addition, the engine coolant could require changing sooner, at 30,000 miles (50 000 km) or 24 months, whichever occurs first. Any repairs would not be covered by your warranty. Always use DEX-COOL® (silicate-free) coolant in your vehicle. {CAUTION: Heater, fuel operated heater (FOH), radiator hoses, and other engine parts, can be very hot. Do not touch them. If you do, you can be burned. Do not run the engine if there is a leak. If you run the engine, it could lose all coolant. That could cause an engine fire, and you could be burned. Get any leak fixed before you drive the vehicle. If there seems to be no leak, start the engine again. See if the engine cooling fan speed increases when idle speed is doubled by pushing the accelerator pedal down. If it does not, your vehicle needs service. Turn off the engine. 312 How to Add Coolant to the Coolant Recovery Tank for Gasoline Engines If your vehicle has a diesel engine, see "How to Add Coolant to the Coolant Recovery Tank" under "Van Models" in the Cooling System section of the DURAMAX® Diesel Supplement for the proper coolant fill procedure. If you have not found a problem yet, but the coolant level is not at the COLD FILL mark, add a 50/50 mixture of clean, drinkable water and DEX-COOL® engine coolant at the coolant recovery tank. See Engine Coolant on page 306 for more information.