Yup, elevate the front of the car and it will eventually burp out. If you're impatient like me, there is a bleed screw (at least on the M103s) on top of the thermostat housing where you can let it bubble out into a bucket below as the pressure builds until there are no bubbles left. Sounds like you need a new mechanic, what a story!

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth