1997 Chevrolet Monte Carlo Owner's Manual - Page 237

NOTICE: If you usean improper coolant mix, your engine could overheatand 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 use the proper coolant, you don't have to add extrainhibitors or additives which claim to be improve the system. These can harmful. I When your engine is cold, the coolant level should at be the COLD mark or a little higher. When your engine is warm, the level should be to the HOT mark or a up little higher. 6-22