Street rod radiator overflow tank1/17/2024 This, in turn, adds more coolant to your system and helps to keep the engine a little cooler. The process of returning coolant back to the radiator is possible because the combination of the reduced steam pressure allows the atmospheric pressure to push coolant from the tank back into the radiator through the vented radiator cap. The smaller spring that can’t be seen is how coolant is returned – through the center of the cap. The heavy spring on the radiator cap that can be seen is compressed when pressures reach roughly. Different manufacturers called them different things: overflow – to catch the overflow from the radiator reservoir – to store the captured coolant or recovery tank – to recover coolant that was expelled when the pressure increased. This was good for radiators, and much better for our environment. Overflow tanks were added to cooling systems to catch the overflow and store it, instead of leaving it on the ground. Overflow Tank – Also: Reservoir or Recovery Tank Capturing that expelled coolant meant that it could then be recovered and reintroduced back into the radiator. Adding a reservoir to that vent tube allowed the steam to be expelled, but also allowed for the coolant that came with it to be captured instead of being discarded to the ground. This process was good for the radiator, but bad for the environment. But as the steam expands, so does the pressure, and often times the vented cap also expels coolant. When coolant expands from engine temperatures rising, it typically creates steam, and the vented cap allows that steam to vent in order to protect your cooling system. Many vehicles back in the 1960s and earlier had a tube attached to the radiator’s filler neck, and that tube vented to the atmosphere (the ground). Here, we will explain both tanks and hopefully clear up any confusion about how each is used. While the names are fairly self-explanatory, and both perform similar functions, there is a difference between the two. We get the question occasionally about expansion tanks and overflow tanks.
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