I have a 1993 Volvo 940t wagon. Does anyone know what the small brown resistor? looking thing is, that mounts on the rear of the ac compressor bracket. It has a small black wire running into it, from what appears the ac compressor clutch. Mine is broken and I want to replace this piece. I have looked online and haven't been able to find a replacement, but I am not really sure what the piece is called, or if someone knows what can be substituted here that would be fine as well. Thanks in advance.