1995 GMC Yukon Owner's Manual - Page 316

Specification 6038-M." Use GM Coolant Supplement(Sealer) with a complete coolantflush and refill. If you use this mixture, you don't need to add anything else. I NOTICE: If you usean improper coolant mix, your engine couldoverheat 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. Some conditions, such air trapped in the cooling system, can affect the as coolant levelin the radiator. Check the coolant level when the engine iscold and follow the stepsunder "Adding Coolant" for proper way to add the coolant. If you have to add coolant more than four times a year, have your dealer check your cooling system. NOTICE: If you usethe proper coolant, you don't have to extra add inhibitors or additives which claim to improve the system. These can be harmful. 6-34