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Why You Don’t Remove The Radiator Cap When The Engine Is Hot

There are thousands of fuel and air combustion cycles per minute in your engine. That chemical reaction combined with copious amounts of friction make your engine a massive heat generator. Therefore, to keep it cool a radiator (a heat exchanger), filled with coolant, is used to transfer the heat away from the engine and into the environment. This means the coolant will most likely be near the temperature of the engine when it reaches the radiator, prompting warnings and hazard signs for you to never open the radiator cap when the engine is hot.

For some reason these guys thought it was alright to uncap the radiator when the engine was overheating. The next thing you know all of its coolant gushed out like a geyser, spraying what looked like boiling water.

Which brings us to another tip: Please always use premixed coolants in your car. Your car can function with water as a coolant, but you would be introducing many more issues down the road. For instance, when water freezes it expands. You run the risk of damaging your engine block in the winter time, since water has a higher freezing point than premixed coolants. Also, if you’re not careful and use regular water instead of DISTILLED water, you risk introducing minerals and impurities that will most certainly damage your coolant pump and miscellaneous components over time. So be smart and don’t cheap out on engine cooling.

(Source: YouTube)

Written by Hansen

The engineer amongst the crew, Hansen once built a mini baja car with his bare hands. Hansen had the opportunity to join Honda’s R&D team in Ohio but chose the life of the east coast and the defense industry instead. A die hard auto enthusiast he religiously follows the auto industry and loves long walks in the auto shows.

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