1995 Chevrolet Suburban Owner's Manual - Page 311

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