![]() In this case, the overfilled coolant reservoir would pop out the built-up pressure through the freeze plug. You could also read through the maintenance tips to know the symptoms of the bad radiator caps. There may also be a case when the cap of the tank would be non-functional owing to its corrosion or tightening. When this happens, the cap of the tank will open, and the hot coolant would pop out like a puddle of lava. As a result of which, the pressure inside the reservoir would increase gradually. When you overfill the coolant reservoir, there won’t be much space left for the heated coolant to expand. In case the expelling does not take place, it could lead to potential damages. Generally, when there is too much coolant in reservoir tank, it gets expelled out through the overflow hose. One of the marks denotes the coolant in the reservoir when it is hot, and the other indicates the coolant present when it is cold. It is known that the coolant reservoir tank usually has two marks. The Possible Outcome Of Overfilled Coolant Reservoir What could it lead to? Read on, to find out. But there may sometimes be a case of the overfilled coolant reservoir. Present in antifreeze or aptly a coolant tank, the coolant needs to be filled to a specific level when you replace it over time. I clean out this area every couple of years, and i was highly surprised at the small mountain of dirt and debris that was loosened when I removed the inner fenderwell cladding.Coolant is one such substance that helps prevent the heating of the engine. Note that there are some "auxiliary" jobs that can and should be done when this hose replacement job is done - specifically the cleaning out of the area behind the inner fender-well cladding, and behind the plastic cladding immediately behind the rear wheel. Total time to do this job, taking one's time, is around 30-45 minutes. I purchased a couple of meters of this hose last year, as I did this same job on my 560SEC. This hose is purchased by the meter from a dealer or via or other vendors. MB no longer makes the OE-style "cloth braided" hose, and instead has superseded the hose to a plain, rubber hose of same inner diameter. However, age does take its toll on this hose, as it does with ANY soft part on Mercedes-Benz automobiles. Generally the hose retains more flexibility in the area behind the fender, where it doesn't see as much heat and elements exposure. Here it is constantly exposed to engine heat, and thus hardens. This especially happens in the underhood area near the coolant tank, where the hose attaches to the coolant tank's neck. With age, and underhood engine heat, this braided rubber hose becomes hardened, and eventually fossilized. Since this is a sealed system, when the cooling system pressure is reduced, the coolant that flows into the overflow tank will flow back through the hose into the main underhood coolant tank. The purpose of this tank is to catch coolant that wants to escape the underhood coolant tank when the cooling system pressure is extremely hot and/or high. This tank is attached to the underhood coolant tank (the big white tank where where the "radiator cap" is) by means of a small-diameter, black, braided hose that passes through the engine compartment wall near the CAN box and hood hinges, and into the space behind the fender where the overflow tank is located. One of the often overlooked "soft" parts on the 500E (and other W124 and W126 models) is the coolant overflow tank that sits behind the passenger-side front fender.
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