![]() ![]() If you are going to buy a new cap from a store, always take the old one with you. This is why it is important to buy a new coolant reservoir cap that is specifically made for your vehicle. The coolant reservoir caps have the same purpose, but they do not share the same design. When replacing a coolant reservoir cap, you have to make sure that you order the same type of cap. Order the exact same coolant reservoir cap If you are looking into replacing your coolant reservoir cap because it is broken, missing, or can’t hold pressure anymore, there are a few things that you should be aware of. How Do You Replace a Coolant Reservoir Cap? You have to read the owner’s manual to find out what is the size, feature, and shape of your cap and get the exact same one. This means that the coolant reservoir caps are not universal. However, a faulty pressure cap can be constantly open allowing pressure to escape, or it can be closed and allow pressure to build up and burst some radiator hoses.Įach vehicle has a different size coolant reservoir. The coolant reservoir cap holds pressure between 12 and 15 PSI before it opens up and releases that pressure into the atmosphere. This makes the coolant reservoir to be pressurized as well. A damaged coolant reservoir cap can cause a coolant to leak, the engine to overheat, or burst radiator hoses. The cap is commonly looked at as nothing serious, but that is far from the truth. If you notice that your coolant cap is failing, it is important to take action. Choosing the correct coolant reservoir cap for your vehicle is essential. There are many differences between coolant reservoir caps like features, shapes, sizes, and materials. In fact, it is safe to say that every car brand has its own type of coolant reservoir cap. No, coolant reservoir caps are not universal. You will experience a loss of coolant from spillage and evaporation and reduced coolant circulation due to a lack of pressure in the cooling system. To summarize, you can drive without a coolant reservoir cap, but it is not advisable. But, this will only put more strain on the water pump which can result in premature wear. The water pump will of course try and maintain the flow. The engine temperature will start to slowly increase which is not a good thing. This means that the circulation of the coolant will be reduced. If the reservoir cap is missing, the cooling system won’t be able to keep up the required pressure. However, it also relies on pressure to keep it circulating around these important engine components. The flow of the coolant around the engine relies on the water pump. When driving without a coolant reservoir cap, the pressure within the coolant system will be disrupted. Anything above 15 PSI and the cap will open up and allow the extra pressure to escape. ![]() The coolant reservoir cap is designed to hold pressure up to about 15 PSI. The coolant reservoir serves to cool down the hot coolant and to reduce the pressure by releasing it through the reservoir cap. Without the required amount of coolant in the cooling system, the engine will quickly overheat.Ī coolant reservoir is a closed system like the rest of the cooling system. ![]() However, when driving without a coolant reservoir cap, the coolant will escape the coolant reservoir in a form of vapor without a trace, or it can spill out while driving on a bumpy road. ![]() Yes, you can drive without a coolant reservoir cap.
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