![]() ![]() As it cools down, it will contract in volume as well. When the engine has been turned off, the coolant will start to cool down as well. See Also: Is It OK to Top Off Coolant With Water? When the pressure of the coolant in the radiator surpasses the designed pressure of the radiator cap, the antifreeze passes the radiator cap seal and flows into the coolant reservoir overflow tank through the overflow tube. When this coolant heats in the radiator, it begins to expand causing an increase in the pressure in the cooling system of that vehicle. The engine coolant absorbs the heat from the engine. When the engine is running at its optimum performance, it needs the engine coolant to keep it within the operational temperatures. The radiator overflow tank is fairly simple device but it can save you a lot of money by preventing rust from forming in the cooling system of your car. See Also: Losing Coolant But No Leaks (What to Do) How a Radiator Overflow Tank Works ![]() This saves you the expense of frequent coolant replacements and possibly the expensive cost replacing a radiator or other components of the cooling system. However, a radiator coolant overflow tank can prevent this problem before it even starts. When rust has formed inside the radiator, you will have no choice but to flush out the system and replace the antifreeze. That air will result in the formation of rust in the cooling system when it comes into contact with the metal in the system. Related: Overfilled Your Coolant? (What Can Happen) I hope this helps.Click Here to chat online with a verified mechanic who will answer your questions. The trick is to have a cooling system that keeps things in check. The cap is the pressure relief/safety valve should anything exceed what it should be and prevent damage to components. This is normal within the operating parameters of any engine. This would allow the coolant to expand over into the tank then get sucked back into the main cooling loop as it contracts. If you really want a "surge" tank (which we call it in my work world) you will need to have a tank than can be pressurized which means the tube from the radiator needs to be on the inside/pressure side of the cap seal and your pick up tube going to the bottom of the tank. I believe the drag rules intent are to make sure any coolant doesn't get spilled out onto the track therefore you will need a large enough tank with a manual drain to contain what you may overflow. Overflow tanks are just that - for overflow and collects what gets puked out. I do not think there will be too much coolant sucked back into the system prior to the cap closing back up. When there gets too much pressure from too much heat, it opens outward (from the radiator) and allows pressure to be relieved and coolant to dump out. The cap opens up as things heat up and pressure builds up past its rating. On an older system, you will see usually the puke tube is on the outside of the radiator cap sealing surface. This is where the pressure and coolant expansion is contained within the coolant system as the coolant heats up and expands. ![]() If you notice on newer cars, they usually have a reservoir that has a pressurized cap and is not on the radiator itself. I know what a coolant catch can is I'm not looking to just run that. Right now I just have a dangling rubber hose. To recap I like the idea of having an extra 6-10 ounces of coolant, then it would be one less thing to check every other time I drive Mercula. I don't understand how the vent line would work here, I wouldn't want it to vent from the button.? If I fill it to just under the cap hole it might puke some out, if I fill and just cover the fins I don't think any comes out. I'd like something that will suck the coolant back into the radiator. I need an overflow can if I want to make some passes at the track. I searched around, but if there is a good thread let me know and I'll just read that one.ģ50 SBC, supposedly crate, no idea on power ![]()
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