Encapsulation shroud or pan or belly pan is a large piece of plastic that covers the underside of the vehicle from about where the radiator begins on back about 3 ft. or so.

Use the SEARCH facility for air bleeding techniques. In one post it was suggested to elevate the front of the car slightly, remove the coolant cap; then start car and watch for air being expelled from the coolant expansion tank. Some simply remove the coolant cap and start the car.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"