2008 Chevrolet Aveo Owner's Manual - Page 246

Checking Coolant {CAUTION: Turning the surge tank pressure cap when the engine and radiator are hot can allow steam and scalding liquids to blow out and burn you badly. Never turn the surge tank pressure cap - even a little - when the engine and radiator are hot. To check the engine coolant, the vehicle must be on a level surface. When your engine is cold, the coolant level should be between the Maximum (A) and Minimum (B) marks on the coolant surge tank. The level rises at engine operation temperature and drops again when the engine cools down. The engine coolant surge tank is located in the rear of the engine compartment on the driver's side of the vehicle. See Engine Compartment Overview on page 5-12 for more information on location. Adding Coolant If you need more coolant, add the proper DEX-COOL® coolant mixture at the coolant surge tank, but only when the engine is cool. If the coolant surge tank is empty, a special fill procedure is necessary. See Engine Overheating on page 5-25 for instructions on "How to Add Coolant to the Coolant Surge Tank." 5-24