Thread: Name that leak
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      10-23-2020, 09:59 PM   #20
B50AteYourRide
a bit obsessed
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Drives: '16 340i x Drive
Join Date: Nov 2019
Location: Mid-Atlantic

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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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