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Well, I tried bypassing the heater core by coupling the 5/8" heater hoses with a pipe thread. It behaves the same - it will get up to "O" after 25 minutes idle. But upon driving, it goes back down to 2mm above the "C" (dead cold). Frankly, didn't have much faith that this would work.
Next, I'll try a new tstat housing. Found one at rockauto.com for $48.
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