Thanks for the help! The problem was the power stage. I replaced it with a used unit and now the system works!

I did put the original ecc module back in the car and now the vent position selector and the ac switch work! The blower fan speed slider causes the "ac power module" which is like the resistor to make clicks as if it's trying to turn on... I'm wondering of that ac power module is the probl...

I am working on a 1997 Volvo 850R and the automatic climate control is not working. I replaced the blower motor because of an overheated wire that melted it's sheathing. Still nothing worked. I then swapped out the main ecc module (the box with the climate control knobs) and still nothing works. The...