Cadillac Repair: 93 STS heat problem, electrical plugs, heat problem

Question
I have a 93 STS 4.6. The problem is I have no heat. Nothing blowing from any vents at all. I have checked all fueses and replaced the blower motor and the PCM and still nothing. The dispaly looks like it is working. It sounds like when I push the buttons I can hear something like maybe the vent doors but that is all. When I checked the codes I don't come up with any. I know for a fact the A/C motor is shot but not sure if that would have anything to do with this or not as this is a very hi-tech car. Any help here would be great!! thanks  

Answer
Your problem is most likely the ECC POWER MODULE that controls the blower motor speed. It is located left of the blower motor as you are standing in front of the vehicle. It has 2 electrical plugs and 3 7mm screws holding it in place on top of the blower motor big black plastic housing. When you remove the power module you will see a large aluminum finned cooling unit attached to the bottom of the power module. replace the power module which comes with the aluminum part.