Come to think of it, I just had to replace the heater duovalve a couple months ago. Was getting the typical bad valve symptoms of hot from one vent but cold from another. That was not an inexpensive part, $300 from Pelican. With all the metal flakes found in the drained coolant yesterday, I wonder if those flakes caused the duo valve to fail? Damaged or clogged the internals of the valve? Seems plausible.

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1998 E300 turbodiesel

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