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One never knows when it will cease to blow. No reason. Just stops blowing when driving or starts a few minutes after the car starts. Weather does not seem to be a cause nor does humidity. Happens on heater as well as AC.
In particularly hot or cold conditions, the fan seems comes on after the vehicle has been running for a while. Maybe five or so minutes. Sometimes it does not come on at all. Also, when driving on interstate on hot days, it turns on and off for no apparent reason.