1995 GMC Sonoma Owner's Manual - Page 198
1995 GMC Sonoma Manual
Page 198 highlights
When the coolant in the coolant recovery tank is at ADD, start your vehicle. If the overheat warning continues, there's one Inore 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. 5-14
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