![]() When everything is working correctly, the radiator cap does a great job at pressuring the system to raise the coolant’s boiling point. While I’ll get more into how it works later in the article, just know that a bad radiator cap can lead to an overheating engine! 6. Your radiator cap does a few different things to keep your engine at the correct temperature. How a Radiator Coolant Overflow Tank WorksĦ Causes of Oil in Coolant Reservoir & What to do 5. But if the radiator cap isn’t working correctly, it can send too much fluid back to the reservoir, sending coolant out of the overflow hose. Once the coolant reaches a specific temperature, it generates enough pressure to open up the radiator cap pressure valve, which sends the coolant back to the reservoir. It’s going somewhere! If you consistently have low coolant, take a look at your radiator cap to see if that’s where it’s escaping from. If you find that you keep adding coolant, that means your engine is either burning or leaking coolant. Your vehicle has a sealed cooling system, so if you had enough coolant one day, you should have enough the next. If that happens, there will be white streaks left on the radiator where the coolant burned off. The radiator cap is at the radiator’s top, and if the leak isn’t bad enough, the coolant might burn off the radiator before it starts to drip off the bottom. Just because coolant is leaking from your radiator cap doesn’t mean it’s making it to the ground. If your vehicle has a coolant leak, you need to investigate further, and the problem might come down to your radiator cap. Your vehicle’s cooling system is a sealed system, which means everything that goes in is supposed to stay in. The most obvious sign that something bad is going on is coolant pooling underneath your vehicle. Here is a more detailed list of the signs of a bad or failing radiator cap to look for: 1. If your coolant is low, that can be a sign that the radiator cap is bad. You may also notice dried white streaks on the radiator coming from the cap. The most common symptom of a bad radiator cap is coolant leaks under the radiator. It’s one of the most critical parts of your cooling system, but unless you’re having problems, it’s one you’ve probably never thought of.īut what does the radiator cap do, and how do you know when you need to replace it? I’ll break down everything you need to know here. While the entire cooling system consists of many different components, one of the most integral is the radiator cap. An overheating engine shuts off and can lead to irreversible damage, which is the last thing you want. Your vehicle needs coolant to run and not overheat.
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