So low coolant warning may appear later than expected. This problem was noted before the warranty expired so I was assured that future repairs will be covered.Īgain - both warm and cold pressure tests revealed no leaks. The service technician put tamper proof seals under both large and small reservoir caps and asked to return when coolant warning appears again. The dealer just advised me that the field engineer hasn't heard / could not find any instance of a problem where coolant loss was due to turbocharger leaking coolant through the bearing.Ĭan someone with this exact same problem post a copy of the repair invoice (minus PII)? I would ask the dealer to specifically investigate this issue. The coolant leaking through the turbo bearing (and evaporating) has been reported in the past. The reservoir cap on my 2017 440i GC was replaced. If present, the main tank reservoir cap needs to be replaced. When the car is cold, remove the main tank reservoir cap and look for white residue. I suspect that one of the possibilities is coolant leaking through the reservoir cap or - more complex - through a faulty turbo bearing. I rolled my eyes as my 435 and 535 engines were turbos.Īnyone out there know if this is something to ignore or something to get shop to investigate further on? If ignore, I'm happy to keep topping off, just want some peace of mine. I asked the dealer service center about it and they said that was common for turbo engines. I have not noticed any liquids in the garage, albeit, this might be such a small leak that it burns off unnoticeably. Given my previous 435, 535 and 645 never had coolant warnings between services, it got me wondering if there is something either unique about the engine in the 440xi where coolant leaks out super slow as designed or if I have a defect somewhere. This part often gets "stuck" and to me only known remedy is reservoir replacement.I've got a 2018 440xi with M-tune with 29k miles and about every 4-6 months, I am getting a coolant low warning. One part is float bar that goes up and down to show level when you remove the cap, other part is float that give sensor reading because sensor doesn't get in direct contact with the coolant at all. Level inside the reservoir is two part system. I poured some water from the side of the tank and watched it flow right to that very spot. Mine is leaking decently from the seam and corner.Īt first I was nervous that my turbo coolant lines were leaking since I saw significant pooling on the subframe below the turbo. If you see white marks and see coolant, you'll have your answer. Clean the side of the tank and go for a drive. You'll see dried coolant on the side of the tank and turbo intake, and possibly pooled coolant on the frame and subframe. Look around the coolant reservoir and on the frame. I thought the same thing so I did the bleeding procedure and absolutely nothing changed. Wouldn't running the water pumps bleed procedure solve trapped air pockets as well? Or do we have to completely drain it all? Moral of story is you probably have trapped air bubbles and by draining the system you can fix your problem for under $30 After doing this I filled up my coolant tank with 2 gallons of distilled water only to flush out the system just to be careful which got a lot more blue coolant out of the system and once I drained that I installed the 50/50 mix and drove around till my car was hot and then I let the car cool off for a few hours and I opened the bleeder screw and a lot of air came out so I filled the coolant up to the line again where it's supposed to be and now I have no more low coolant light. After getting that mixed I lifted the front of my car on a Jack and removed my front innercooler (extremely easy to do) and then unscrewed the screw on the bottom of the radiator which drained about 70% of the coolant so then I disconnected a hose near the radiator plug (forgot the name of it) which got the other 30% of coolant out. I did a 50/50 mix (one gallon of coolant and one gallon of distilled water in a 5 gallon bucket and then mixed it together. After checking my coolant level it was filled exactly where it was supposed to be but I continuously was having a low coolant message pop up on my car so I thought it was the sensor in the bottom of the coolant tank but after replacing the coolant sensor it still remained so I went ahead and decided to buy factory blue bmw coolant with 3 gallons of distilled water. My 2011 335i had a low coolant light singe I got it from the dealership.
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