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What to Do When Engine Coolant Smokes and Boils?

1 Answers

VonMichael

07/29/25 2:10pm

The solutions for engine coolant smoking and boiling are as follows: 1. Do not immediately open the filler cap after the cooling system boils: The radiator will have some internal pressure after boiling. Opening the filler cap at this time can cause hot water to splash, leading to scalding. The correct approach is to open the louvers near the radiator after noticing the boiling to increase air circulation. Wait until the water temperature decreases and stops boiling, then use a wet towel to cushion your hand, partially unscrew the radiator cap to release the hot air, and then fully open the filler cap. Be careful not to face the direction of the filler opening. 2. Do not immediately turn off the engine after boiling: At this time, the engine's internal temperature is too high, keeping the machine components in an expanded state. Stopping the engine immediately can cause some parts to detach or lead to cylinder sticking. Therefore, keep the engine idling for a while and fully open the radiator louvers. 3. Do not pour cold water on an overheated engine at this time: Some people, in a panic, may want to cool the engine immediately by pouring cold water on it. The consequences of this action are very severe, as it can cause the engine block to suddenly cool and crack, resulting in irreparable damage to the engine.

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