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There is a block drain bolt on the passenger side of the engine block underneath the exhaust manifold. There is also a radiator drain at the lower left front of the radiator. Fill the system with either MBZ brand coolant or Zerex G05 if possible (both are a light yellow color).
Take off the upper radiator hose to fill up the engine block with coolant. Then re-attach the hose and fill the rest through the expansion tank. You can squeeze the upper radiator hose with the radiator cap off to "burp" the system. Fill up coolant to the seam in the expansion tank. Drive around a bit and run the heating full blast. Then re-check the coolant level and top off if necessary.
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