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1955-59 GM Truck Heater Cores

Surprise, the deluxe fresh air square heater core for these five years (of the same design cab) are slightly different. They begin by using water outlet and inlet pipes the same ½ inch diameter as most all early years.

Apparently in 1958, these connectors increased in diameter to 5/8” diameter. It is only assumed this allowed more water flow and thus more warm air in colder climates. Viewing later factory heaters they continue with this larger 5/8” diameter on GM vehicles.

Currently, this square truck heater core is under production. A “step-up” rubber hose will be included. Thus, the new cores will be correct for either diameter of water outlet.

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