As the title suggests, I have no cooling fan. I can hook up 12V direct and it works fine, unplug the sensor and I get nothing. When the sensor is unplugged I am only getting 6v to the fan and good continuity to ground. As far as I can tell there are no relays on this unit and it utilizes the PDM in front of the fan. I am assuming this stands for Power Distribution Module (I could be way off but it sounds good.) Could this thing be my problem? I believe I have found that it controls the power to various modules. I opened it up and nothing looks burned on the circuit board, but I am by no means well versed in circuitry.