However, it is essential to regularly check and top up your engine coolant level when needed. Not only will you lose a ton of coolant as it shoots out of the radiator cap opening, but it’s also going to be scalding hot.With the hot weather hitting the UK you might not think the increased temperatures will have too much of an effect on your car. It’s essential to never take the radiator cap off of a hot engine! The system is pressurized, so as soon as you take off the cap, all that pressure has somewhere to escape. Once you’ve located the radiator cap, you’ll need to press down on it and twist it to take it off. The radiator cap is located on the top of the radiator – typically on the left or right side, but sometimes right in the middle of the radiator First, you need to locate the radiator, which is usually in the front of the engine bay. While many people overlook the radiator cap, it’s typically easy to find. Related: 10 Best Engine Antifreeze & Coolants Radiator Cap Location The radiator cap’s vacuum valve sends more coolant to the radiator to keep everything at the right level. It’s pretty straightforward when you take the cap off, you can add coolant directly to the radiator, but you can’t have an opening with the engine running, or else you’ll introduce air to the system, which is detrimental.įinally, when coolant starts to cool down, it contracts, which lowers the coolant level in the radiator. Third, the radiator cap seals the system. The radiator cap has a set point where it opens up to send the excess pressure to the reservoir, which has an open excess coolant hose to relieve the pressure safely. ![]() Excess pressure can blow up hoses, the cap itself, and any other weak points in the system. Second, while some pressure is good, too much is detrimental. Without a pressurized system, the coolant will start to boil, and your engine won’t be able to cool down effectively. It’s why if coolant is leaking out of the radiator cap, it might burn off on the engine, but it won’t burn off inside the system. ![]() This pressure raises the boiling point of the coolant.
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