Del does not follow his own advice, AKA Cummins Whale

WHAT A STEAL! Congratulations on the buy! My dad bought himself a 24v as soon as they came out. Amazing truck and he still babies it to this day, 20ish years later. As far as the heater goes, I just hope its not your heater core, that is one hell of a job to do... ask me how I know. Also, re-route your main black vacuum line and the green vacuum line that run right next to the heater core along the firewall, to the front side of the heater box as soon as they go out (trust me, they will) and that will eliminate a lot of headaches in the future. Have fun!