This article is from the Toyota Tundra FAQ, by Steve Yee with numerous contributions by others.
In some cases with earlier 2000 Model Year Tundra versions, your Tundra will
spill coolant out the overflow vent path. This can occur when you encounter
very rough or rough and angled driving conditions (read: Off Road !). There is
a TSB out on this that fixes the problem by replacing the coolant fill bottle
assembly.
 
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