Thank You for writing into AskPatty!! I recommend that you have your blower motor control replaced, the resistors may be worn on the medium position. Having this replaced should restore full function!
Hope this Helps!!
A. J. Valle
〉 Answered on Jun 25th, 2012 by Amanda J. Pierce, MBA "AJ", Certified Mechanic, Project Coordinator; Primavera Scheduler at VIGOR Alaska Industrial Shipyard & BizzM3ch Solutions