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Why does your overflow pop off from the pressure build up?

Updated: 8/16/2019
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15y ago

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Assuming you mean the cooling system overflow.

If so:

* A worn or damaged coolant cap can cause coolant release long before the engine heats up. * an overfilled cooling system will release coolant when the engine warms. * If an engine overheats, either from low coolant, damaged or plugged radiator or worn out or damaged water pump or thermostat, the heat from the engine will turn remaining coolant to steam, creating quite a bit of pressure. * Once an engine has overheated it is possible that the head or block have been damaged. Damage can be either a warped head or as severe as a cracked head or block. You need to determine WHICH has caused the excessive pressure.

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Q: Why does your overflow pop off from the pressure build up?
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