1996 Chevrolet Tahoe Owner's Manual - Page 279

What to Use Use a mixture of one-half clean water (preferably distilled) and one-half DEX-COOL (orange-colored, silicate-free) antifreeze that meets GM Specification 6277M, which won't damage aluminumparts. Use GM Engine Coolant Supplement(sealer) (GM Part No. 3634621) with any complete coolant change. you If use this mixture, you don't need to add anything else. TM NOTICE: If you usean improper coolant mix, your engine could overheat andbe 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, heatercore and other parts. [f you have to add coolant more than four times a year, have your dealer check your cooling system. Adding only plain waterto your cooling system can be dangerous. Plain water, or some other liquid like alcohol, can boil before the proper coolant mix will. Your vehicle'scoolant warning system is set for 'the proper coolant mix. With plain wateror thewrong mix, your engine could get too hot but you wouldn't getthe overheat warning. Your engine could catch fireand you or others could beburned. Use a 50/50 mix of clean water andDEX-COOL (orange-colored, silicate-free) antifreeze. TM NOTICE: If you usethe propercoolant, you don't haveto add extrainhibitors or additives which claim to improve the system. Thesecan be harmful. 6-26