I am new to this forum. I have a 2003 Expedition 4.6 and after rebuilding the engine I have a vacuum line that is no longer attached coming from the heater control valve. Would like to know where it terminates. I think it goes through the firewall but really am struggling to figure out where. I have seen a few vacuum diagrams but they lead me no where. The only mode that works is the Defrost. The blend door seems ok since I can control the temp no problem.
2003 XLT 4.6
2003 XLT 4.6