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It might be a bad thermostat, or something worse, such as a blown head gasket/cracked head. Either of those scenarios will cause the cooling system to pressurized beyond it's specified capacity, and the pressure will force the coolant out of the reservoir.

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โˆ™ 2005-01-20 05:59:54
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Q: What can cause the radiator water to leak from the top of the reservoir tank?
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