1994 Chevrolet Blazer Owner's Manual - Page 215

B' The coolantlevel should be at or abovethe ADD mark. If it isn't, you may have a leakin the radiator hoses, heater hoses, radiator, water pump or somewhere elsein the cooling system. NOTICE: Engine damage from running your engine without coolant isn't covered by your warranty. If there seems to be no leak, start the engine again. See if the fan speed increases when idle speed is doubled by pushing the accelerator pedal down. If it doesn't, your vehicle needs service. Turn off the engine. How to Add Coolant to the Coolant Recovery Tank If you haven't found aproblem yet, but the coolant level isn't at or above the ADD mark, add a 50/50 mixture of clean water (preferably distilled) and a properantifreeze at the coolant recovery tank. (See "Engine Coolant" in the Index for more information about the proper coolant mix.) 5-13