Generally, when there is too much coolant in reservoir tank, it gets expelled out through the overflow hose. There will also be additional fees and taxes added to this as well. An overflow tank can also be referred to as a recovery tank and is the simpler system of the two. 93 4.0 Was overhauling the coolant system and see there is no overflow tank. It has to go somewhere and preferably not onto the ground. Coolant expands as it gets hot and flows from your vehicle's radiator into the overflow tank. This convenient design makes it easier for you to safely check the fluid. 5 Symptoms of a Bad Ignition Switch (and Replacement Cost), Curb Weight vs Gross Weight (What’s the Difference?). Some older models have latches underneath the hood that you simply press or pull on. Also, a general coolant question. With your help I hope to put an end to the mystery of the coolant expansion/overflow tank in my 1997 Honda CRV. The first step is to grab a towel. Some manufacturers … As you may know, an engine that is working very hard will heat up very quickly. How to Know When to Change Your Radiator Fluid, How to Mix Concentrated Antifreeze with Water. Why do I not have the vacuum to suck the fluid back to the radiator? The plastic tank you generally add coolant too is actually an 'overflow' or 'reserve' tank. The coolant bottle provides a place into which coolant can expand without causing damage. As a result, you can expect the temperature of your engine to rise and become overheated. If it's full you're good. So what would happen if the coolant overflow reservoir tank became cracked, damaged, or overflowing? The purpose of the radiator coolant overflow tank is to store excess coolant that is released from the radiator due to pressure build up from heat. Under normal thermal expansion, the coolant, which was cold when filled 100% into the tank, spilled over into the overflow tank. I just bought a new 2014 WR450 and while the main radiator is full and topped off the overflow tank has nothing in it. Thanks Deren, it all makes sense now, and an excellent explanation there . You should notice small puddles or drops of coolant on your garage floor or in your driveway. Just as the title states, on the 2012+ WR450s should there be some coolant in the overflow tank? Water also won?t protect the cooling system from corrosion, in some cases, it can add to it.eval(ez_write_tag([[250,250],'carcareportal_com-large-mobile-banner-1','ezslot_13',120,'0','0']));eval(ez_write_tag([[250,250],'carcareportal_com-large-mobile-banner-1','ezslot_14',120,'0','1'])); It?s important to keep up with your radiator fluid, it is a part of basic vehicle maintenance. I'll make sure to fill the radiator header tank about half-way, right now its … There are a few signs that could indicate it?s time to change your radiator fluid. I have seen the overflow in use when the coolant boiled and went out of the overflow tank, I think I've got that under control now . Many reservoirs do have a minimum and maximum markings on … As the engine cools down, the coolant contracts creating a partial vacuum in the radiator top tank. Thermostat. The overflow hose just runs down towards the ground. Under normal thermal expansion, the coolant, which was cold when filled 100% into the tank, spilled over into the overflow tank. So, the radiator coolant overflow tank functions to serve this exact purpose. Water boils at a different rate than coolant. Always check underneath the vehicle after filling the radiator. If there is coolant leaking ensure that the coolant is at the correct level when the engine is cold. Some coolants are brilliant blue and others are a clear white. See Also: Best Radiator Stop Leak Products. Your owner?s manual should include a section on the vehicle?s radiator, along with optimal fluid levels. 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