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How Long Should You Wait to Open the Radiator Cap When the Car Overheats?

1 Answers

DiAshlyn

07/29/25 4:07pm

When the car's water temperature is too high, you should wait for more than 15 minutes after stopping the car before safely opening the radiator cap. If you encounter high water temperature while driving, do not immediately turn off the engine. Turning off the engine will also stop the water pump, preventing the coolant from continuing to circulate. At this time, all parts of the engine remain at high temperatures, and if they are not effectively cooled, it may damage the engine. The correct approach is to keep the engine idling for a while, turn the car's heating to the maximum fan setting to help dissipate heat, and open the engine hood to assist in cooling. Only turn off the engine after the coolant temperature drops to a normal level. After parking, wait until the coolant temperature drops to normal before opening the radiator cap. Wear gloves, cover the radiator cap with a wet cloth, then slowly unscrew the cap slightly to allow steam to escape gradually. Once the internal pressure of the radiator has decreased, you can open the cap to add antifreeze.

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