![]() The good news is radiator caps are simple and inexpensive to replace. Most likely, replacing the radiator cap will become necessary because the cap not only keeps coolant in the radiator, it also maintains the pressure necessary inside it for the fluid to be pumped around the engine. If the problem remains small, this solution may be satisfactory for a while. Coolant may simply be added periodically to replace what is lost. The solutions to this particular situation are easy and inexpensive. Anytime your vehicle experiences a loss of coolant and you can’t find a leak, check the radiator cap. The amount becomes noticeable over time, but it is difficult to identify the source of the leak. For example, a hairline crack in the radiator cap can allow tiny amounts of hot coolant to escape into the air without any visible clues. Often, the leak is so slow or in such a hidden place that it is not visible. If the amount of coolant in the system is diminishing over time, it means it is exiting the cooling system somehow. With all the parts involved-hoses, radiator, radiator cap, overflow reservoir, water pump, etc.-there are many opportunities for liquid to leak or evaporate out of the system, or for contaminants and other fluids to find their way into the system. The cooling system is designed to be a closed system, meaning nothing should enter or exit. Make no mistake, low coolant level is a problem that must be addressed. Why Is the Level Low but There’s No Leak? Without the cooling system, the engine would overheat and simply stop functioning. This is a simplification of the cooling system process, but it offers a glimpse into how it works. Together as coolant they make a great team and keep the engine running smoothly for thousands of miles. Water alone would boil and freeze antifreeze alone would not cool the engine very effectively. Additionally, antifreeze includes additives that fight corrosion in the radiator and in the cooling system’s hoses and water pump. Antifreeze keeps the water from boiling while the vehicle is operating and from freezing solid in the winter. When it comes to the two elements of coolant-water and antifreeze-water does the work of absorbing heat from the engine and relinquishing it into the air. The coolant in the radiator is then pumped through hoses back towards the engine where it begins the cycle all over again. The coolant is then pumped to the radiator where a fan blows the heat out into the atmosphere, dropping the temperature of the liquid. To keep them from overheating, the cooling system pumps coolant- a 50/50 mixture of water and antifreeze-through the engine to absorb the heat and cool it down. The metal parts inside the engine are designed to withstand hot conditions, but much higher than 220 degrees for an extended period of time would damage them. To give you a sense of how hot that is: Water boils at 212 degrees. It is an incredibly hot ecosystem-roughly 195-220 degrees Fahrenheit under ordinary conditions, and even hotter for short periods of time. Additionally, mechanical parts are moving at hundreds of miles an hour against each other continuously. ![]() Sparks are igniting fuel and air and creating hundreds of explosions every minute inside it. ![]() The engine of your car or truck is an inhospitable place for just about anything. ![]() Let’s take a look at the critical role coolant plays in an automobile engine and then determine how low coolant can occur without a leak. It is possible for levels to drop without a visible leak, or any leak at all. How can it be that the level of coolant in your car is low but you don’t seem to have a leak? Aren’t low coolant levels an indication of a leak? And what is the big deal about coolant in the first place? ![]()
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