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Cooling fans are on a thermostat and should only come on when needed. Climate control also only engages the interior fan when it is needed. Not sure if this helps but the question was a little vague, sorry if I missed the mark.
I had the same problem and after checking all the appropriate fuses was looking for the cost of a new switch and noticed another with the same problem and directed me to the 4-pin connector under the glove box. I noticed electrical tape coming loose and thought maybe the connector had been hit by a passengers foot, etc. I jiggled the connector and reseated it and tried the fan switch and it worked. I then taped the 4 pin connector up against the housing with electrical tape and it has been working fine ever since. Maybe the connectors do not mate properly or are too loose of engagement. Hope this helps....saved some $$$$......Can't believe electrical tape was used by GM in lieu of some other more attractive method.