2000 GMC Sierra 1500 Pickup Owner's Manual - Page 333

yellowblue Checking Coolant The coolant surge tank is located on the passenger's side of the engine compartment. The vehicle must be on a level surface. When your engine is cold, the coolant level should be at the FILL COLD mark. If the LOW COOLANT message comes on and stays on, it means you're low on engine coolant. See "Low Coolant" in the Index. 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. 6-30