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Old 11-24-2022, 04:48 AM   #8
1966 K10
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Join Date: Sep 2017
Location: Rainier, WA
Posts: 153
Re: AC heater box in bad shape

Im in the same boat, burb had a ton of mice and additional damage to the core plate. Found another box to put in meanwhile since its a daily driver.

I never realized how different the regular deluxe heater and the A/C box with the re blend flap. Not sure if A/C boxes are specific or just modified from the factory. If you look close at a regular box there is almost an imprint of where to cut if you were to add the flap.

The heater core for the A/C box is HUGE compared to the standard unit.


I will pressure wash then soak in evaporust to see what is left to work with. Dont think there is any rust through, flap rods might be wasted though.
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