Re: i know i'm ignorant....but still could use some info!
On the factory AC system, the heater is inside the cab, and the pipes come out one above the other. For the heater-only trucks, the heater core is under the hood, so there are no holes for the heater pipes in the firewall. Also the openings in the firewall for the air are quite a bit different. Did your truck have a dealer or aftermarket A/C system?
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1971 C10 Longbed, 350/TH350
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