So I have this 73 f100 that I inherited and I am restoring it from the ground up. I noticed, since it has been cold, that the heating system has been bypassed and taken out of the truck. I still have the vents and the controls but there is no heater core or blower motor or anything on the engine side of the firewall. It originally had an airconditioning system as well but I'm not going to fool with that. I was plannig on just going to a pull apart place and start from there but if anyone has any suggestions as to where to start that would be great. Even if it is just a picture or diagram of the heating system.