Heater doesn't work so good - 74 Duster

Make sure your heater hoses are hooked up right-I know most people say it doesn't matter. I've never seen a service manual, that says it doesn't matter. They have pictures of each body style with arrows in the hoses and where they are hooked up-so apparently it does matter. In the mid 70's I was driving my 68 GTS as a daily driver, winter also. I couldn't afford a new heater core so I would just change the whole heater box, hoping it was better. It was like in January-cold, and I had just changed the box. Heater blew out just barely warm air. Buddy asked why my heater didn't work any better. I told him I had just put in a different heater box-he asked-did I get the hoses on right? I changed hoses around, and I had hot heat.