My inside blower works when I put it in the ON position.. but,, will not come on when in the auto position and the outside central unit is on. After figuring out that something was wrong, I noticed the pipes outside frozen. I had a service man come here and put freon in the system. It worked fine for a few weeks,then started acting up again. So,, when I put the ac on auto,, wait for the system to start... the outside is working,but the inside blower isnt/?

Sounds like a problem with the thermostat. Posting the brand & model # of the indoor unit would be helpful. If you feel comfortable doing so, try this: turn off power to the system, and access wire connections to thermostat. Typically, the "R" & "G" circuits control the indoor blower. Remove these two wires from thermostat & connect them together. Turn system power back on & check for blower operation. If running, the thermostat isn't properly managing blower operation for some reason. If not, you likely have a problem with the blower control or motor.