The blower on our old carrier weathermaker is not working. The furnace goes on and so does the air. Can we just repair or get a new blower for the unit. I do not want to replace the entire system. Thanks

I don't see why not. This unit uses a 4 speed motor where two taps are selected, apparently during installation. There is also a capacitor which could be defective.

There should be universal motors available too.

Using 58sxc here: American HVAC Parts would give you some idea of parts costs.