air actuator seems to be stuck in defrost with low flow...

I recently noticed that my climate control system seems to be stuck in defrost only and my blower motor bearing seems to be squealing again (UGHHH). I'm looking for a new linear actuator for an automatic climate control system but I seem to be unable to find the part number for the linear actuator. For the blower motor does anyone know where i can just get a new bearing because I have repacked it twice now in a year...