However, upon cooling, it still put a bunch into the overflow, leaving my level way below the cap. Coolant is not very dirty No leaks (checked with a pressure tester too) Have bought 2 radiator caps and tried an old one (tested those too) Radiator is a year old And i know for sure it is coming from my overflow drain tube because i set the tube in a place that i could see it was draining and the tube and that area was wet. Removing it and whether the fix will hold up under the average 15 psi pressure may impose challenges and risks to question the validity of the repair. Hey Victor, A radiator overflow tank collects the expanding coolant that is heated by the engine and recycles it back into the coolant system once it loses enough heat. Your problem may simply be a loose or damaged cap not keeping coolant where it needs to be. After this liquid passes back into the radiator, the reservoir will normally be left with only 1/3 of the coolant. noticed that the coolant overflow bottle is filling up and not returning the coolant back into the radiator. Got it all back in with the reservoir level at most an inch above top line. You need to check the level of coolant in the radiator as well. just undo the small clamp (usually jsut needs a pair of pliers) around the hose on the radiator end and let it drain. This puts the outlet in coolant when at proper level. While the engine is off, your coolant reservoir should be about 30% full. Coolant is under pressure so it does not boil, which make bubbles, bubbles do not transfer heat to radiator walls where it can be dissipated into the atmosphere. Once the driver parks the vehicle and turns off the engine, the heat dissipates which causes the coolant to not be as hot anymore. The coolant won't "suck" back into the system until it fully cools. If that's not happening, it means that you've got a leak in the radiator, or a hose, or in the engine itself, and you're losing that vacuum, and leaking coolant out of the system. Here’s how to do that: Wait until the radiator has cooled. Fill your reservoir with antifreeze up to the FULL line at the middle of the plastic tank, you don’t have to add water, because the water will evaporate in a few days and what is left is antifreeze which will not evaporate. There is signs of coolant in the top tank when i top up - so the radiator is not dried up. The coolant would drain into the reserve reservoir, but would not drain back into the radiator, and I would have to keep refilling. The radiator cap comes in different pressures. If there are any leaks in the system, air will be drawn into the system via those leaks instead of drawing coolant from the reservoir. I went back to town and replaced the rad cap. 1900 subaru legacy wagon. I also "burped" a few of the hoses as I was refilling. Most car's have a radiator drain valve that will be visible at the bottom tank or on either side tank. Seems that its not holding pressure or there is AIR in the system. This is normal. The coolant used to cool the engine does so at maximum efficiency when kept at specific pressure. The excess fluid flows into the overflow tube and goes into the overflow tank. This leakage is visible and may result from bad reservoir cap. This did not fix the problem. When you warm up your engine, the coolant expands and builds pressure, then the radiator cap allows the excessive coolant at a given pressure to flow into the reservoir. The reservoir is where excess coolant collects when hot and then is sucked back into the radiator when cold. There may be times that the reservoir radiator cap may turn out to be faulty. The hose could have small cracks at either end that would prevent a good seal. When the system chills, the coolant stored in the reservoir is pulled back into the radiator by the reduced pressure. Check your owner's manual for proper cap replacement. It must not be the case that upon cooling the system is overpressurized and that is why it puts coolant back into the overflow, because with my wifes vehicle, I don't think it ever sucked it out of the overflow to begin with (probably a leaky cap like everyone mentioned). Some coolant should push into the reservoir when hot and go back in as the engine cools. To release pressure, the radiator cap allows some coolant to escape out, stored in the reservoir. If a valve is not available loosen the lower radiator hose and slowly remove it from the radiator to initiate the draining process. While this may seem to be a minor issue, it can lead to dire consequences. When you turn off your engine, and the cooling system starts to cool down, then there is a vacuum drawn from the radiator and the coolant in the reservoir is sucked/drawn back up the line into the radiator. It spills back into the reservoir tank (plastic tank attached to the radiator) then it spills out onto the engine and everywhere else. to a rad. With a couple of days driving the level returned to normal. I noticed though that the overflow tank would fill but not siphon coolant back into the rad. So, the radiator coolant overflow tank functions to serve this exact purpose. If you look at just about any overflow reservoir (not an expansion tank), the hose from the radiator run off goes to the bottom of the tank (or dips down to the bottom of the tank from the lid). Once the engine cools down, the extra coolant flows back into the engine through a vacuum system. Therefore i am constantly topping up the radiator when it has cooled down. This overflowing coolant passes into the reservoir where it is stored until the engine cools. Coolant is pulled back into the radiator by a partial vacuum, as the radiator cools after driving. The reservoir might be cracked so it leaks and when the radiator gets hot and it overflows all the coolant leaks out. The coolant reservoir on your Accord is connected to the radiator, and allows coolant to flow back and forth between the two as it heats and cools. The video above shows you where the coolant reservoir in your Contour is located and how to add coolant. As this coolant warms, it expands. shop and have them flush it or just replace it The radiator cap is designed to allow access to fluids in a ‘closed' system. When you start the engine the water begins to warm. It should drop, and if you take the cap off the coolant should be filled to the top. Over time, the coolant reservoir can leak, become worn, and fail because it is used on a regular basis. Have a fluid catch basin ready to catch the now draining coolant. In normal circumstances, the coolant gets ousted out from the reservoir overflow tube, the moment the engine starts warming up. Before coming home i topped up the rad again, and had overheat issues again after about 2.5 hours of highway driving. when it cools off the radiator level goes down a bit but never goes any lower. So. After ~5 months of waiting, still no plug…no change. A new hose is cheap. Mix the coolant with distilled water so that you have a combination of 50% coolant and 50% water. This allows for excess pressure to vent to the reservoir as well as any coolant. This expelled coolant moves against the spring in your radiator cap. Open the drain valve by turning the it counter clockwise. I replace new cap and radiator and I still have the same problem. So you'll want to mark where the coolant level is when hot, and then come back when the car cools down and see if it's dropped. 99 Toyota Avalon, 3.6 L engine, 160k miles The engine sends radiator fluid to the overflow reservoir but doesn’t suck it back into the engine when it cools. - Answered by a verified Subaru Mechanic the small hose that goes into the overflow tank (reservoir you're talking about) runs to the top of the radiator right below the radiator cap. If the crack is on the inside, then any drainage would go back into the reservoir and not spill out on the ground, but it would break the vacuum that would draw coolant back into the radiator during the cooldown. the cores in you're radiator are very small and in time get pluged and the water does not circulate causing pressure so then it pushes the water into the reservoir so then you have only air in the cooling system I have tried rad. Overflow tank had filled and coolant had shot all over the front passenger wheel well in particular.. Be sure to check your owners manual to determine the correct type of fluid to add - for Fords, it will typically be in a section titled Fluid Capacities in the back of your manual. If the coolant reservoir is completely empty, you can’t just refill it. My mechanic replaced the radiator, cap, and hoses…no change. Coolant goes into reservoir but doesn't get drawn back into the radiator when it cools. The excess coolant goes into the reservoir. flush but it has never worked when they get that bad take the rad. A cracked or leaking reservoir can easily be diagnosed and fixed. Once you are done driving, the coolant will slowly cool down as the engine does and the radiator cap will allow the coolant stored in the reservoir to flow back into the radiator. Coolant in the radiator is 100% full. Without a coolant reservoir, the expanding coolant would be pushed out of the radiator cap and allowed to spill on the ground, which is an environmental hazard. Maintenance/Repairs. As the system cools down, the contracting coolant creates a vacuum that draws coolant from the reservoir back into the radiator. I replaced the radiator and thermostat on my 98 Subaru Forester but still when I drive it the temperature gauge reads over the hot line the heater doesn't work but the coolant doesn't seem to be circulating to where its supposed to be. Coolant Reservoir doesn't drain back into Radiator. When the system cools down, the radiator pressure reverses and coolant is siphoned from the reservoir back into the radiator. he put a chemical in the radiator fluid that is supposed to form a plug to stop a leak. I subsequently poured it back into the reservoir (it was low, but not completely empty) with the coolant vent valve open, until I got coolant coming out of it. 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