The M104 is self-bleeding through the design of the cooling system. Top the overflow tank all the way up and let the car run. This usually takes care of it as the air will be allowed to work itself out of the system. There would only be a reason for for to become trapped in the system if the coolant was changed and the system not bled properly through the method I just described.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record