![]() So I filled them and then monitored the levels. The secondary system reservoir was also dry. My main coolant system was down well over a quart. My car was CPO so I assumed everything had been checked. It runs at much lower temps than the main system. I'm pretty sure it's a totally separate system. If this system is sealed where would it be leaking too? I know its not the main cooling system but regardless it performs a function to keep the charge intercoolers cool and the computers cool.or so I’ve read.ĭoes this system bleed back to the main cooling system or is it completely independent? If so could I have a leak I wonder or perhaps it has never been topped up. I’ll buy some from my dealer up the road. I was checking levels and thought I would check this and to my surprise it appeared to be completely empty! I’ll take your advice and only use BMW coolant. Yes my little centre reservoir appeared to be empty too! Having not much to do I washed the car today and hosed the engine bay down to remove dust. ![]() In the center tank, there was no fluid visible at all (the yellow plastic min/max lines were visible) and on the one nearer to the firewall, there was fluid visible but far down, right at the bottom of the neck.ĭo I simply add fluid to both these areas directly? What type of coolant and how much should I buy? ![]() This part often gets "stuck" and to me only known remedy is reservoir replacement.I checked both coolant reservoirs today (one in the front middle under the engine cover and one on the front right fender near the firewall) and they were both very low. 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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