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Here is a diagram of how I plumbed mine. I removed the coolant flow from the servo (due to a leaking servo for the 3rd time! And I only drive it in the summer. If I drove it every season I may have done something else) Now it is plumbed so the coolant will always flow from the tee on the right to the tee on the left and then circulate back to the engine (or I guess radiator upon full operating temperature). The ball valve, when closed will not allow coolant to flow into the heater core giving no heat in the cabin. When the ball valve is open the coolant will flow both towards the heater core and follow the path to the other tee giving heat to the cabin.
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2009 ML320 Bluetec
1985 300CD
1981 300TD
Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD
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