2006 Chevrolet Cobalt Owner's Manual - Page 266

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 5-29 for instructions on "How to Add Coolant to the Coolant Surge Tank." Checking Intercooler System Coolant (2.0L L4 Supercharged Engine Only) {CAUTION: You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol, and it will burn if the engine parts are hot enough. Do not spill coolant on a hot engine. When replacing the pressure cap, make sure it is hand-tight and fully seated. The intercooler system fill neck is located in the front of the engine compartment, near the center of the vehicle. See Engine Compartment Overview on page 5-12 for more information on location. 5-26