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The old (1980s generation) Mercedies Benz 300d's have a climate control that you set the temp and there is a little pump inline to the heater core , it regulates what if any flow goes to the heater core.. kind of cool idea also..
you set 80 on the heater and it only allows full flow till the cabin gets up to 80 then it slows down the flow.. to regulate the temperature in the cabin.. its more of a off on thing like in a house thermostat.
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