optional A/C [factory or dealer installed] for the cars started in 55, so no doubt GM was scheming on it for trucks soon after .... it would be in the "Accessories Installation Reference Manual" for whatever year, as it is in the 1960 Accessory Price Schedule

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics