Tom, how hot does your dash heater get?
Mine is just warm, not enough to even keep my little toesies warm on a cold day. I have 4 valves on engine, heater under the bed, and in water bay.
I added a valve on each of the coolant lines under the bed to keep it from getting hot. Even with the heater switch off I found that it heated up the bedroom.
But the dash heat is not nearly as hot as the heater under the bed.
Great investigation tracking down your problem.
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