I wish that burping was always that simple! Sometimes M117's 'burp' quite easily, othertimes..not so much. I like to fill the cars on a bit of an up hill..I will also pull the upper hose off the rad and fill through the hose until it won't accept any more. Keep the HVAC on defrost the whole time..the aux H2O pump will help you out.

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta