and added new stuff to it. The overfill container is also filled to the hot mark so i have plenty of antifreeze in there. I assume the waterpump works because when i was filling the radiator back up i could see the fluid flowing constantly. I checked the fan clutch by spinning it and it did not move real easy but it did move? You should be able to hear that fan kick on while driving or stopped at a stop sign correct? Well could the ecu be a culprit if it already has a bad knocksensor output on it?