Hi, I just bought a 1989 Cadillac Deville and ever since the Fuel Data Center & Climate Control Center display a "C" and sometimes a "D". I haven't been able to get anything to work on them and the fan always blows. I've found out that this is a very common problem and could be fixed by replacing the Climate Control module itself or the Body Control Module. I've purchased a CCM, but I'm unsure on how to remove the old one to replace the new. I can't get it from the front and can't exactly get it from underneath. (I can only disconnect it) Before I go ripping everything apart, I'd like to hear a expert's opinion on the matter. Do I even need to replace it? Or is it something else? I also tried a diagnostic on it but it wouldn't work. Strange thing though is when we diconnected it everything started working again for just a few minutes then went back to a "D" and "C" code.