A/c not working on auto

[Fmdavis80]

We have a 2011 North trail that we just bought. The a/c works great but it will only blow air with the thermostat set to low cool. When we put out on auto you can hear the a/c running but it doesn't blow. We replaced the thermostat and that didn't help. We are only concerned cause we are full time in it so the a/c runs constantly

 

[Hollandt]

We have a 2011 North trail that we just bought. The a/c works great but it will only blow air with the thermostat set to low cool. When we put out on auto you can hear the a/c running but it doesn't blow. We replaced the thermostat and that didn't help. We are only concerned cause we are full time in it so the a/c runs constantly

I can think of a few things that could be an issue. The high speed of the fan motor is burned out, The high speed relay in the control panel is not working properly.