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BMW 3-Series (E90 E92) Forum
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Low coolant level SOLVED
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12-07-2019, 12:50 AM | #1 |
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Low coolant level SOLVED
My 2011 335i had a low coolant light singe I got it from the dealership. 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. 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 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. 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. Moral of story is you probably have trapped air bubbles and by draining the system you can fix your problem for under $30
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12-07-2019, 08:20 AM | #2 | |
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Drives: 09 335i, 11 335xi, 17 X3 M40i,
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12-07-2019, 09:31 AM | #3 | ||
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12-25-2019, 02:11 PM | #4 |
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Im completely new on this site. So im probably in the wrong section but, can anyone help me? My car looses coolant slowly while im not driving it. Looses it quicker when i am driving it. Has slight oil in tail pipe and on start up slight blue smoke from tail pipe. It also has smoke coming from front radiator area after driving for a while. Bmw 335d 2010 e90 it has ben remapped also. Not by me. Thanks
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12-25-2019, 03:44 PM | #5 |
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12-25-2019, 03:48 PM | #6 | |
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12-25-2019, 06:45 PM | #8 | |
Is it the shoes!?
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Use a mirror and look under the seam. Clean the side of the tank and go for a drive. Come back and look the next day. If you see white marks and see coolant, you'll have your answer. Mine is leaking decently from the seam and corner. At first I was nervous that my turbo coolant lines were leaking since I saw significant pooling on the subframe below the turbo. I poured some water from the side of the tank and watched it flow right to that very spot. Phew! |
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12-26-2019, 11:07 AM | #9 | |
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01-25-2020, 02:50 PM | #10 |
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My et tanks seals were all busted, and the cap wouldn't stay sealed. I just replaced the et with temp sensor. Drove to work this morning and got the same temp warning yellow>red limp mode. When I replaced the et I topped off fluid and let the engine run for 15 min with the cap off for the et to let any air escape. I'm thinking next might be the water pump itself? 110K miles
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01-25-2020, 02:55 PM | #11 |
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You can run it cold with the reservoir tank uncapped for 10 min. or... press the start button with the fob inserted without your foot on the break, then crank your heat up and the pump should start moving coolant through the et.
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01-25-2020, 04:34 PM | #12 |
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Yep. The bleed procedure will do the same procedure as mechanics have done for years and years and years, but with the electric pump. Plus some other optimizations. It's the easiest bleed procedure of any car I've had.
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02-05-2020, 03:14 PM | #13 | |
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02-05-2020, 03:28 PM | #14 |
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Are you purchasing OEM or aftermarket? Often is installer error. If you jam funnel in there to pour coolant you could get the float stuck.
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02-05-2020, 03:30 PM | #15 |
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I've replaced twice with Rein aftermarket tank. No funnel jamming. This time around it was fine for about two months, then the light came on. Then it went off for a couple days, and now it's back on.
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02-05-2020, 04:44 PM | #17 | ||
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02-05-2020, 04:49 PM | #18 |
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First and cheapest thing would be to get a Genuine BMW sensor and to throw the Rein one in the garbage.
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TOTALED | 2011 E90 335i xDrive - BMS Cold Air Intake - ETS Charge Pipe - ETS 7" FMIC - MHD Stage 2+ - GFB DV+ - PE Mod - VRSF Catless Downpipe - xDelete - xHP Stage 3
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02-05-2020, 09:27 PM | #19 | |
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02-06-2020, 07:39 AM | #20 |
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Say NEIN to Rein!
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03-04-2020, 12:11 PM | #21 |
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I went ahead and got the whole OEM reservoir, which comes with the OEM sensor already. So far it's working perfectly.
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