![]() ![]() ![]() The hot coolant then flows through radiator hoses into the radiator where it is cooled before circulating back to the engine. It does this by circulating a coolant mixture through passages in the engine block and cylinder head, absorbing excess heat. ![]() The cooling system’s main job is to keep your engine from overheating. How the Cooling System Works in BMWsīefore diving into the common causes of coolant leaks, it helps to understand how the cooling system works in BMW vehicles. Read on to learn why your BMW may be losing coolant without overheating along with actionable tips to stop leaks and keep your engine running smoothly for years to come. This detailed guide will cover the 6 most common reasons for a BMW coolant leak without overheating and how to diagnose and repair the issue yourself.įinding the source of a coolant leak can be frustrating, but it’s important to fix it promptly to avoid potential overheating issues or engine damage down the line. Hopefully tomorrow when I drive it again and it warms up, it should be good to go.Is your BMW losing coolant but the engine isn’t overheating? Don’t panic, help is here. If I had to guess, I think the float was put in upside down. I tried this on both laying on their side in the same position. The OE, the magnet grabbed the float all the way in at the tippy top, but on the behr one it caught the magnet right when I put the magnet into where the sensor goes. I actually took my telescoping magnet thingy and put it in both expansion tanks. I still have to wait for it to cool overnight and to see if it comes on during warm up (which is what the other one did) but so far no issues. Sure enough, original tank and the light never came on. It only had about 9k miles on it but I was being paranoid. I actually noticed the light is kind of buffered and it takes a while for it to turn on/off unless you cycle the ignition.Īnyway, I pretty much narrowed it down to the tank and pulled the behr one and put the OE one I originally had in there back. I put the original sensor back on and put a magnet up to it. But not sure if this would cause the light to always be on or just sometimes. What else can I check? Is the expansion tank itself bad?! I've heard about after market expansion tanks being assembled with the float upside down. ![]() I can't have TWO bad OE sensors?! And the car runs totally fine even with the insane heat. I even swapped the sensor from the washer and it just stays on constantly. When I do that the light never turns off. I tried swapping the OE coolant sensor from the tank that was in before. It's off when I start the car, when it's warming up, it comes on and stay so on until the car is at operating temperature. So my question is this, I keep getting the damn low coolant light! Ive checked it a hundred times and it's never low. I even watched the obd II temp like a hawk and it is usually around 195, never above 204. Ever since then I've been driving it around and the needle's never moved past middle, even with the insane 115 deg weather we're having in so cal this weekend. Parked it, let it fully cool down, then opened it up again and it was a little low so I topped it off. I drove it around to full temp, needle never went above middle. So much liquid came out of the bleed hole that no bubbles were left because I put in so much extra coolant vs water. so I put 1/2 gal of pure bmw coolant to counteract the dilution and the excess all came out of the bleed screw. I had put in 1 gal of water and nearly 1 gal of 50/50 mix before I realized it was 50/50. I had it up on jackstands (front only), turned car to on (but not started), set hvac to 91 and lowest fan setting, opened bleed screw and took it off, opened expansion tank and slowly filled in coolant and water until it was full. I broke the little hot/cool label on it yanking it out and just decided to replace it along with everything else, including radiator, water pump, 5 hoses, lower temp sensor. It already had a pretty new expansion tank that is OE. So I redid my entire cooling system on Monday. ![]()
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