1997 Oldsmobile Cutlass Supreme Owner's Manual - Page 203
1997 Oldsmobile Cutlass Supreme Manual
Page 203 highlights
How to Add Coolant to the Coolant Surge Tank If you haven't found a problem yet, but the coolant level isn't at FULL COLD, add 50/50 a mixture of clean water (preferably distilled) and DEX-COOL coolant at the coolant surge tank, but be sure the cooling system, including the coolant surge tank pressure cap, is cool before you do it. (See "Engine Coolant', in the Index for more information.) TM Steam and scalding liquids from a hot cooling system can blow out and burn you badly. They are under pressure, and if you turn the coolant surge tank pressure cap even a little they can come outat high speed. Neverturn the cap when the cooling system, including the coolant surgetank pressure cap,is hot. Wait for the cooling system and coolant surge tank pressure capto cool if you ever have to turn the pressure cap. -- -- ~ 5-16