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Uploaded on Oct 4, 2008
Here is a more detailed explanation of why exactly failed on my heater control valve.
There is a white plastic core inside the black plastic housing of the heater control valve assembly. The white plastic is directly attached to the valve part of the assembly.
The white plastic part has a house-shaped protrusion. The valve arm has a house shaped cutout that fits over the white protrusion, much like how a carriage bolt fits in a square shaped hole.
The problem with my heater valve assembly was that the white house-shaped protrusion has become overstressed and had sheered off. I thought it was a stupid idea to have plastic on that part of the valve, but then again plastic does not rust.
Consequently, I replaced the entire assembly and the heat was back up and running.