Well the section starts on page 24-9 in the '05 manual. Next the main A/C Heater Control Module connector looks like a 29 pin , the three pin connectors are from sensors and should not have 12v on them.


The main schematic for the HVAC module is on page 24-60 with power from fuses 33, 35 and 37 (36 and 15 run other HVAC components. Ground is on pin 12.


That said if the fan is working properly I doubt that the problem is electrical If you look at the diagram on page 24-67 you see a "coolant circulation valve" (6) that controls the heat by varying the water flow through the heater core. This is unusual in modern cars since response is so slow. The systems I am used to parallel the AC and heater using air blend doors to control heat.


So in a case where the controls work but is always on full hot, I would look at the circulation valve first and not the module.


This is a little confusing since page 24-74 refers to "blend doors" and never mentions the coolant valve while the diagram on page 24-63 shows the heater and AC in series and no temperature blend doors.


Guess someone who has taken one apart needs to chime in because the service manual does not make sense.