Okay i have no response from my heat or ac my ac fan doesnt even turn on in my 1994 Volvo 850 turbo. I've replaced the blower motor resistor and the blower motor still works. i dont know whats going on with it?

 

how u know the blower motor works?? is it a ccm or mcc??

 

so when you say you get no response, you mean no air comes out of the vents? if you already replaced the blower motor resistor and you KNOW that the blower motor works, the only other part of the system is the control head. im not sure what model you have but a manual controller would be pretty simple to replace, the digital controller may have to be reprogrammed.