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I took one of the mixing boxes off and found that the original design had no seals and the valve cannot completely shut off. They allow heated air in the cabin regardless of the control position. Go figure.
I bought some of the 1970's or later mixing plenums to install. They are cylindrical construction and have seals, so they should provide a much cooler ride. I have air conditioning in the plane now, but I sit up front and roast with the engine heat leaking in while the women in back are freezing.
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