Bought a 2004 Dodge Ram pickup in "as is" condition. The car salesman showed me how everything worked including the heater. When I got it home I found out air only came out of the dash vents, and it would not select either the floor vents or the defroster vents. With the aid of the shop manual, I was able to determine the plastic diverter door was broken inside the heater. I would have to remove the airbags, drop the steering wheel, remove the A pillar covers, remove the radio, remove the glovebox, drop the dashboard, then disassemble the heater. When I started this job I discovered that someone had tried to do this without the aid of a service manual. I could see where they took a sawzall to structural steel that held up the dash. They also managed to cut some other wires by accident. When they tried to remove the airbag controller, they bent some pins on the connector, then plugged it in again causing a 12 volt short circuit the vaporized some pins. Apparently, they gave up and reassembled the mess. I spent four full days on this job. Eventually I was able to get at the heater and replace the plastic part. I also was able to repair the airbag controller. No wonder they sold this truck "as-is".
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