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CVO 2/4/2013See this A/C Heater Blower Motor Resistor
For your 2009 Toyota Corolla 1.8L SFI DOHC 4cyl
http://www.autozone.com/.../N-jt1zhZ91tag
Blower motor resistors divert power or ground through resistors to control blower motor speed
When not replaced, blower will either not function or will not run at all speeds