2008 Chevrolet Impala Owner's Manual - Page 274

Checking Coolant The coolant recovery tank cap has this symbol on it. Adding Coolant If more coolant is needed, add the proper DEX-COOL® coolant mixture at the coolant recovery tank, but be careful not to spill it. If the coolant recovery tank is completely empty, add coolant to the cooling system through the coolant fill neck on the engine. See Engine Overheating on page 5-29. {CAUTION: See Engine Compartment Overview on page 5-14 for more information on the location of the coolant recovery tank. The vehicle must be on a level surface when checking the coolant level. When the engine is cold, the coolant level should be at the COLD FILL line or a little higher. The COLD FILL line is marked with the same symbol as the coolant recovery tank cap. Turning the radiator pressure cap when the engine and radiator are hot can allow steam and scalding liquids to blow out and burn you badly. With the coolant recovery tank, you will almost never have to add coolant at the radiator. Never turn the radiator pressure cap - even a little - when the engine and radiator are hot. 5-28