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This is completely normal - the low speed fans keep the temperature from continually climbing when passive air cooling through the radiators is not adequate. the fans will switch to high speed when the low fans are not able to keep the temperatures down. In traffic low speed fans are fine. With AC in ~95F traffic, low speed fans are also normally adequate. High fans come on under a variety of circumstances, but as long as you can hear them coming on at any point, then you know they work, so ideally they will come on when required.
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