Quote:
Originally Posted by crystalworks
Here's the procedure.
1. Start car and get up to operating temperature.
2. Set heater fan and temp to full (so full fan and 90 degrees)
3. Set the temp wheel between the vents to the 3 red dots for full heat
4. Open bleed screw and watch for air bubbles
5. Close bleed screw when clean flow of coolant with no bubbles
6. Let engine cool down, check the coolant level and top up as necessary.
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I think the correct procedure of bleeding any BMW is slightly different than what was posted above. Here is what's the Bentley & TIS has for procedure:
- set the temp all the way to Max, fan speed at min
- key in pos II, engine off, cold engine - this will start the aux pump for the heater core
- open expansion tank & bleed screw(s) (pending on model - some have 2)
- Level is low - slowly add coolant while monitoring the bleed screw(s) - air should hiss out
- coolant level stabilizes close to max, steady stream of coolant is coming out of the bleed screw(s). tighten the bleed screw(s) - not much force
- adjust the level as indicated on the exp tank
- close expansion tank & hood
- go for a drive 2 blocks should be OK.
- re-check the coolant level (engine is still not warm) & top if necessary
- Take car for a drive until reaches operating temp.
- Stop the car & wait until engine is cold.
- Check again level & top if necessary. Done
if the coolant level still drops after this, there might be a coolant leak somewhere, and a pressure test should be performed.
GL
P.S.: Forgot to mention: car should be on a level surface, but preferably have the front ever so slightly higher than the rear.