Originally Posted by Mich_525
The reason why that aux pump is there , is when the weather hits -10C, when you stop at a traffic light (at low rpm) the coolant flow is weak and no hot anti-freeze gets to your heater core , then your fan blows cold air inside the cabin. I were you I would rather fix it before the real winter starts
Its good in theory, but after owning several car without aux. water pumps, i have never noticed cold air at idle...I think its just as good as the water cooled alternator idea!
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