2003 Chevrolet Tahoe Owner's Manual - Page 382

Checking Coolant The coolant surge tank is located in the engine compartment on the passenger's side of the vehicle. See Engine Compantment Overview on page 5-74 for more information on location. The vehicle must be on a level surface. When your engine is cold, the coolant level should be at the FULL COLD mark. If the LOW COOLANT LEVEL message comes on and stays on, it means you're low on engine coolant. See "Low Coolant Level" under DIC Warnings and Messages on page 3-62. Adding Coolant If you need more coolant, add the proper DEX-COOL@ coolant mixture at the surge tank, but only when the engine is cool. Turning the surge tank pressure cap when the engine and radiatorare 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. You be can burnec you spill coa In hot engine parts. Coolant contains ethylene glycol, and it will burn if the engine parts arehot enough. Don't spill coolant on a hot engine. When replacing the pressure cap, make sure it is hand-tight. 5-29