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201240 - Call 3

Sarah’s having an intermitten heating problem, and needs to get through one more Alaska winter. The heater works at random times--it blows cold air, then she hears a “shoom” noise, and heat starts. The temp lever operates, and all the fan speeds work. The problem is in the heater control valve--it’s not allowing one or more blend doors to open to let heat in. Get someone to look under the dash to see what’s not moving when she adjusts the temperature lever.

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