For more information on our testing methodology and how we evaluate every product, check out our methodology page here. When testing is not feasible, however, our aim is to make your life easier by doing all the online research for you and presenting that research in the form of easy-to-read product comparisons and buyers guides, rather than outright recommendations. We try to perform in-house testing on real vehicles whenever possible before making our recommendations. Our team of writers, editors, researchers, and product experts collaborates to thoroughly vet top products. Since 2020, we have published over 200 auto product reviews in an effort to make shopping for auto products easier. ![]() We looked at factors such as standout customer reviews, prices, meaningful superlatives, and discount shipping eligibility. We also factored in the quantity and quality of online retailer reviews from websites such as Amazon, RealTruck, Advance Auto Parts, and more. We pay particularly close attention to quality reviews and recommendations that highlight the quality of warranties, customer service support, build quality, materials, and overall reliability. Since the coolant in the main system is what is keeping the car engine cooled, it will most likely not cause the car to overheat, but it is in this case that you will see coolant pooling under your car when it sits for long stretches of time.To select the five best radiator stop leaks featured in this buyers guide, our team first combed through dozens of resources such as DIY mechanic and auto enthusiast forums, manufacturer and radiator stop leak-specific websites, instruction manuals from manufacturers, and reviews from online retailers. You may also find that you have a crack in the coolant reservoir. ![]() These too are easy to diagnose by a visual inspection. Leaks in the water pump, heater core, or engine freeze plugs can also allow coolant to escape. Most likely you can easily spot where the leak is coming from by looking at it a split or broken hose or a hole in the radiator are two good examples. More often than not, when you have an external leak, the coolant escapes and your car quickly overheats. 3 - External LeakĪn external leak is the type of leak which is most easily diagnosed. An internal leak could be caused by a leak in the head or block or perhaps a leaky head gasket which lets the coolant escape its system. Instead, it will be noticeable when your coolant level does not stay constant and you find that you need to constantly refill the tank to keep your engine from overheating. 2 - Internal LeakĪn internal leak won't cause a puddle of coolant under your car. Refer to your car’s manual for the proper cap and pressure. This can be diagnosed with a pressure test of the radiator cap. The radiator is a pressurized system so if there is a loss of pressure from the cap not fitting properly or if the cap is the incorrect cap for the radiator, the pressure will be lost and a leak could occur. ![]() If you have a leaky or a weak radiator cap, you may experience loss of coolant from the overflow tube every time the coolant heats up. Below are the common causes to your coolant leaks: 1 - Leaky Radiator Cap It is a good idea to check the level of the coolant reservoir tank with every few gas fill-ups. Oftentimes, the type of leak is easy to determine but sometimes it takes a little more effort to find it. You may even be able to smell the coolant leaking. This could be evidence of a slow leak in your system.Ī suddenly overheated engine is also another key tip-off that you may be facing a coolant leak. You may notice that coolant has collected on the ground under your car or that your reservoir tank is not as high as it should be. There are really only three common causes for coolant leaks, although each type of leak has several possibilities, varying in severity.
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