10-18-2020, 12:56 PM | #1 |
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Name that leak
So today, I noticed that this fluid was coming from my passenger side wheel well.
Anyone know what this is? Car was running fine, but as I passed it in the driveway I saw that there was a pool of this green/blue fluid. Any help would be appreciated. |
10-18-2020, 01:52 PM | #4 |
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It doesn’t have that usual coolant smell, but maybe BMW uses something different. It seems rather dark to be wiper fluid. I guess I’ll have to open it up either way.
Anyone know what that heat exchanger over there is? It does seem to be water based, as in washes off the hands with soap and water. It’s an M Sport. |
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10-18-2020, 03:09 PM | #6 |
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Here is a more useful picture.
Seems to be coming from this exchanger right here, or the hose right by the wet spot. Anyone know what that is? A secondary radiator of some kind? |
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10-19-2020, 08:57 AM | #8 |
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it's just an additional radiator for engine cooling. find the leak and replace whatever was damaged. it won't be covered under warranty if you have one.
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10-19-2020, 03:01 PM | #9 |
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Thanks everyone for the helpful replies. I did some more digging and it's definitely one of two auxiliary radiators that I have. From my internet research, most if not all have an auxiliary radiator on the driver side (US Spec), but a smaller subset have a second auxiliary radiator on the passenger side; M Sport and Track package, but perhaps others as well.
To my knowledge, this car did not come with the track package, but it is an M Sport. The part number is on the side: 17117628057 It seems as though the same part is for either the driver or passenger sides. These are about $200.00 online and seem to be very easy to replace. No warranty concerns here. |
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10-19-2020, 06:09 PM | #10 |
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This seems related to the weak heat exchanger the Bx8 engines are becoming known for. Rocks are puncturing those things and BMW retroactively created a rock guard kit lol.
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SOLD: 2016 340i xDrive 6-speed DAW v2.5 turbo E40 | Dorch S2 | VRSF DP | MST intake | AWE catback | 335is clutch | CSF heat exchanger | RK Autowerks intake manifold | Orange M Perf Brake Kit | KW Street Comfort coilovers | GTS taillights V2 |
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10-19-2020, 06:51 PM | #11 |
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A guard is probably not a bad idea. For the auxiliary radiators as well?
I speculate this was a rock that cracked a tube in the aux radiator. The main radiator is behind the condenser and intercooler exchanger I believe. It may not get all that much airflow. |
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10-20-2020, 12:48 AM | #13 | |
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10-20-2020, 06:25 AM | #14 |
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10-21-2020, 10:16 PM | #15 | |
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Another process I saw, that I think is specific to the B58, is similar in that you go into accessory mode, but you start the engine. The engine runs, and for a few cycles you are supposed to hold the gas to 3,500 RPM for 10 seconds, then back to 1,200RPM, for 30 seconds, then repeat a few times. Then it seems you just let it idle till it’s done. It seems rather different, mainly because the engine is running. Do you know the correct process for the B58? Basically, should the engine be running? |
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10-22-2020, 03:18 PM | #16 | |
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10-22-2020, 03:36 PM | #17 | |
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It also says I should plug the battery to a charger. If the engine is running, why would I need to do that? Wondering if I can safely skip that step. Just checked, the N55 has an electric water pump. I didn’t know that. Last edited by B50AteYourRide; 10-22-2020 at 04:02 PM.. |
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10-23-2020, 01:42 PM | #19 |
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The engine circuit has an electric pump and a mechanical pump, the intercooler circuit only has an electric pump. Both pumps can be activated with a specific sequence of buttons/pedal in the car, so if you're doing that with the car off then a charger is recommended.
I did it without a charger and didn't have any issues. Even if the battery does die or the car cuts off, it just turns off the pump. Not really dangerous. |
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10-23-2020, 08:59 PM | #20 |
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I ended up borrowing a NAPA charger from the neighbor just to be safe. It did seem ridiculous, but that's what the manual said. It probably is overkill. I even took it off wrong and made a nice spark. Probably more harm than good.
Everything works though. Shutting down NewTis didn't help. Here are the steps for anyone with this problem in the future: They say you can only refill the coolant (assuming the system has been completely drained) with a vacuum filler device. In this case I just topped it off and started from here: • Adjust coolant level in coolant expansion tank for high temperature to maximum . • Shut the sealing cap on the coolant expansion tank for high temperature. • Connect battery charger. • Close driver's seat belt. • Switch on ignition by quickly operating the START-STOP button three times. • Adjust blower to lowest Level, adjust heating to maximum temperature. • Floor the accelerator pedal and hold for 15 s. • The automatic cooling system bleeding routine is being introduced. • Start engine. • Idle speed is automatically increased to 1200 rpm. • Operate accelerator pedal till approx. 3500 1/min , hold engine speed 10 s . • Idle speed for 30 s. • Operate accelerator pedal till approx. 3500 1/min , hold engine speed 10 s . • Idle speed for 30 s. • Operate accelerator pedal till approx. 3500 1/min , hold engine speed 10 s . • Idle speed for 30 s. • Operate accelerator pedal till approx. 3500 1/min , hold engine speed 10 s . • Idle speed for 30 s. • Operate accelerator pedal till approx. 3500 1/min , hold engine speed 10 s . • The cooling system bleeding routine has finished approximately 11 min after the engine starts. • Engine speed drops to idling speed level once again. • Switch off engine. • Allow the engine to cool down. • Adjust filling level in coolant expansion high temperature to maximum and overfill with 200 ml. • Close the sealing cap (1) until it lines up with the arrows. Here is an illustration they give you for the sequence of engine revving steps. So there it was. Had to submerge it in a 5 gallon bucket with my thumb and an air compressor to find it. Must have been a stray bit of something. It was experiencing some high velocity airflow that day. |
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