1997 GMC Safari Owner's Manual - Page 283

NOTICE: If you usean improper coolant mix,your engine could overheat and be badly damaged. The repair cost wouldn't be covered by your warranty. Too much water in the mix can freeze and crack the engine, radiator, heater core and other parts. If you have to add coolant more than four times a year, have your dealer check your cooling system. Checking Coolant I NOTICE: If you usethe proper coolant, you don't have to add extra inhibitors additives which claim to or improve the system. Thesecan be harmful. When your engine is cold, the coolant level should be at ADD, or a little higher. When your engine is warm, the level should be up to FULL HOT, or a little higher. 6-27