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Re: Does running the heater decrease gas mileage?
ever take the dash out of one of these? I do it atleast 3 times a month in the winter, the heater core and evaporator for the A/C are stacked on top of each other, the controls of today dont work on a simple cable control they once did, there is a water shutoff valve to the heater core, it is a huge problem child on some vehicals (not ours, ours are a real bitch to get to) change dozens of them in the summer months when the heat doesn't shut off and or the ac shop cant get the ac worken right.
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