1996 GMC Jimmy Owner's Manual - Page 270

What to Use Use a mixtureof one-half clean water (preferably distilled) and one-half DEX-COOL TM (orange-colored, silicate-free) antifreezethat meets GM Specification 6277M, which won't damage aluminum parts. Use GM Engine Coolant Supplement (sealer) (GM Part No. 3634621) with any complete coolant change.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 your by warranty. Too much water in the mix can freeze and crack the engine, radiator, heater core and other parts. Adding only plain water to 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 With mix. plain water or the wrong your engine could mix, get too hot but wouldn't get the overheat you warning. Your engine could catch fire and or you others could be burned. a 50/50 mix of clean Use waterand DEX-COOL (orange-colored, silicate-free) antifreeze. If you have to add coolant more than four times a year, have your dealer check your cooling system. NOTICE: ~~~~~~~~~ If you use the proper coolant, don't have to you add extra inhibitors or additives which claim to improve the system. These can harmful. be 6-23