Just completed a fan delete mod on a '96 328is. Replaced the thermostat, aux fan switch, fan pulley, thermostat housing and belts. Flushed the coooling system and re-filled with distilled water, BMW blue coolant and a bottle of Redline water wetter. Ran the car three times and added more water each time as level went down. First time, I noticed a leak between the lower radiator hose and the thermostat housing - I forgot to completely tighten the hose clamp. Other than that, no leaks. Last two times I drove it, I noticed that the temp gauge would stay right in the middle and then suddenly start moving quickly towards the red zone. I turned around and went straight home the first time but by then the temperature had gone back to normal. The second time, it got all the way up to the red zone just before I pulled into the driveway. I jumped out and opened the hood just as the auxiliary fan came on. The temperature went right down and stayed down as the fan went on and off several times. Then, it just stopped going on and I had to shut the car down because the temperature went right up into the red zone. I checked both fuses for the fan and they were both fine. Any ideas?