I thought I needed to do the same thing, and found out I had some heat coming into the car via the heater. I refurbished the box with new seals, gaskets, but when the heat is shut off, it still is allowing a small amount of heat to get into the car. I placed a towel over the discharge vents and what a difference. It was 92 yesterday and it wasn't real uncomfortable in the car. (no air, windows down) All this time I thought it was heat coming through the floor and firewall.
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Jimmy M
68 GTO
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