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Year: 1987
Hello everybody. Attached to the evaporator case is a little box with a dial in it. There is two-headed arrow shaped like a circle pointing toward L and H next to the dial. I figure that turning the dial would increase (High) or decrease (Low) something. I tried turning it while the engine was running and the a/c was engaged but didn't see any difference in the the engine RPM, blower motor speed, or coldness output. What is it for? Thanks for your input.
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