My fan on my 85 300SD will not come on it makes an attempt to start but never does.If I put power to it directly it runs fine.Could it be my resistor is bad?Where is it located and how can I check it?Also have a problem with my climate control in that if I turn my dial just a little off cold it throws too much heat.Can any one tell me where my inside cabin sensor is or I also read that there might be some kind of piece of foam that goes bad and can be replaced with a plastic line.Does any one know where I would find this on an 85 300SD.