Toyota Revo SR 2000 (1.8 - Gas M/T) - Overheating Problem

[dr. d]

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normally, modern cooling systems remain full for months on end..
if yours does not, then either you have a leak somewhere, or you are overheating.

coolant prevents rusting or oxidation of the metals in contact with the coolant, thus helping maintain the cooling ability of the cooling system..
but it does not directly prevent overheating. in fact, it lowers a teeny bit, the heat-carrying ability per unit volume, compared to plain water.