![]() ![]() If this happens, you should check your radiator for any leaks or damage and make sure that it isn’t clogged with debris. This causes excess heat to build up in the engine and will boil the coolant in the coolant reservoir. When your radiator is damaged, it cannot properly cool down the engine. The pressure will push coolant into the overflow tank and then out of it through the fill cap on top of the tank. If your coolant reservoir is leaking, it will allow air to build in the cooling system causing bubbles and boiling. If your coolant reservoir is leaking, it will allow pressure to build in the cooling system. If you don’t see any signs of leakage on the outside of the reservoir and the temperature gauge is not in the red zone, go ahead and drive it straight to a mechanic-it might be nothing, but it could also be the beginning of major problems. If you notice any steam coming from under your hood or if your coolant light is on and your engine is running too hot, check your coolant reservoir immediately. Boiling liquid expands, so the excess boils over into the engine and causes significant damage, including cracked cylinders and warped cylinder heads. (You can read more about blown head gaskets here.) When a car overheats, the liquid coolant in the reservoir gets hot enough to boil. The most common way coolant ends up boiling is when you have a blown head gasket. Pressure builds in the cooling system and pushes coolant out of the radiator and into the overflow tank. When a head gasket fails, it causes compression leaks. This is one of the most common reasons for a coolant overflow condition. Coolant Boiling in the Reservoir Causes Blown Head Gasket Getting this checked out early can help reduce damage to your car down the road. It could be an overheating issue, but it also could be something as simple as a dirty radiator or fan, or even a small hole in one of the hoses. If you see boiling in the reservoir, it’s time to bring your car in for a check-up. As the car ages, you will start to notice small bubbles in the reservoir, which is totally normal but should be fixed before it does any damage. When the car is running, coolant shouldn’t be boiling in the reservoir. Check these troubleshooting and repair guides for more help on your BMW.Related Posts Is it Normal for Coolant Boil in the Reservoir? We hope you find the 2004-2013 BMW 3-Series Check Level & Add Coolant guide helpful. This guide applies to the following BMW models Only add the coolant type recommended by BMW. ![]() BMW 3-series uses the floating device to determine the coolant level. If the level is below the minimum mark, you will need to add coolant, or your 3-Series may overheat. Look at the coolant reservoir tank and note the low and high levels. Check BMW 3-Series Coolant Level Remove cap.Open the cap only when the engine has cooled down. On a 3-Series, the coolant expansion tank is located on the passenger side of the engine. This is where you can check the coolant level and add coolant if the level is low. Locate the Coolant Reservoir. Next, you locate the coolant reservoir (tank) on your BMW.Lift the hood and secure it in the open position. Next, you must release the hood safety latch at the front of the car.Pull the lever until you hear the BMW hood pop open. Locate the hood release underneath the dashboard of your BMW 3-Series. ![]()
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