Developed a small leak in the radiator on my '04 D2; when ordering a replacement, I noticed it said "for cars with SAI." I didn't recall seeing any wiring plugged into the radiator, so I took a second look and, sure enough, the hole just below the lower hose is plugged. I don't see any loose wiring hanging around, either. Does anyone know that the part number for the sensor is? TIA, mike