1994 GMC Suburban Owner's Manual - Page 219
1994 GMC Suburban Manual
Page 219 highlights
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 radiator but be sure the cooling system is cool before you do it. 5-15
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