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First make sure the temperture gauge is working correctly, maybe you only think it's getting too hot.
You also have to be very careful in your assesment of the aux fans: with the engine off, turn the left (drivers side) fan hub and make sure that BOTH of the fans are rotating, the drivers side drives the passengers side via a thin grooved belt. When you are seeing both of them rotating, it can be the engine fan sucking air through the radiator that is making the other fan rotate.
A few other things: The apparent speed of the aux fan can be a very subjective thing, at 100% speed it should be absolutely "howling". The fan or fan controller may be a problem.
You should also ensure that there isn't alot of dirt and garbage build-up between the AC condensor and the radiator, it can collect quite badly between there and you can't normally see it.
Does it cool properly at highway speeds?
Gilly
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