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Hi Don,
No, the difference between the temp needle just below, at, or above the gauge midline is irrelevant to what we're discussing: any reasonably warm engine temperature reflects sufficient coolant heat to operate the heater.
Even at a high gauge reading, turning the heater valve off should completely block coolant flow through the heater core. Thus, the temp gauge reading doesn't matter. I still think the valve is defective because it's not blocking coolant flow.
You have a 122? I'd expect it has the same type of manually-operated valve to control coolant flow through the heater core.
Keep at it!
-David
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David Brick, Santa Cruz CA, 1988 245
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