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In the picture labled 'L', there is a red nob on the left with a flathead screwdriver slot in the bottom, turning it should release fluid from the rad.
You will also need to open the drain on the passenger side of the engine block under the exuast manifold if you wish to get out all of the fluid. (edit: what you have labled 'B' looks about right [but cleaner than mine])
There is a bolt along the sensor rail on top of the head (on an M103 not sure about M104) that will allow air into the back side of the system and allow it to drain faster/more completely. (like opening a can with only one punch hole at the top it wont drain well from the block if you don't open that bolt.)
'C' is the thermostat housing.
Also open the expansion tank.
Last edited by A264172; 04-03-2007 at 02:54 PM.
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