I had my 94 SPi in a parade the other weekend and towards the end of the it, my car started getting REALLY hot (was a hot sunny day and where were not even going a walking pace). There was far too much noise around to hear if the aux fan was running but something tells me it wasnt. Heres why. Since the weather over on this side of the pond has started to warm up, I have been driving me Mini a lot more. I've notice the aux fan kicking on when I would not expect it to, like a really cool morning and only a few minutes into a drive...where I have been moving along steadily with no other car in sight. What really makes me wonder is that I have heard the fan kick on and off quickly. Like, come and then switch off after a few seconds. Its my understanding that these should come on at a certain temp and then switch off when it gets several degrees below that temp....so nearly impossible for that to happen in a few seconds.
So, assuming I have an issue, where should I start? The rad is the upgraded super 2-core with screw-in sensor. The aux fan does at least work. There is coolant in the rad with no leaks. I have also installed an aux temp gauge in the car that takes it temp from a sensor mounted in the Minis traditional location; in the head, under the thermostat.