2003 Honda Accord V6 with Navi System. After a summer of driving, I noticed I was not getting any cabin heat when the weather became colder this fall.. The heater control (located in engine compartment) did not move. I disconnected the cable, and was able to move the control valve manually. Now I get heat only on the passenger side. There is only cold air in the drivers side (under dash vent, defroster vent) . What should I look for to solve this problem?

A broken wire perhaps

A broken wire? Haha I'm going through the same deal bro in fact same year and car. It seems to be a black eye on Honda cause they cant even diagnose this issue either. They are quoting people heater cores and flush services that only bandade the issue for a day or two which also baffles me. If you find out more please share