1994 Chevrolet Corvette Owner's Manual - Page 154

How to Add Coolant to the Coolant Recovery Tank If you haven't found a problem yet, but the coolant level isn't at or above the "COLD, mark, add a 50150 mixture of clean water (preferably distilled) and a proper antifreeze at the coolant recovery tank. (See "Engine Coolant"in the Index for more information aboutthe proper coolant mix.) NOTICE: In cold weather, water canfreeze and crack the engine, radiator, heater core and other parts. Use the recommended coolant. I When the coolant in the coolant recovery tank is at or above the "COLD" mark, start your vehicle. If the overheat warning continues, there's one more thing you can try. You can add the proper coolant mix directly to the coolant high fill reservoir, but be sure the cooling system is cool before you do it. 153 ...