Just brought home a 1999 sebring JXI Air controls from vent to floor to defrost worked great for a few days, now it's stuck on vent. When I turn the directional switch with fan turned down, I can hear servo's operating buy only for a second, then it's silence. Where can i find the actuator or servo that controls where the air flow goes. I'm in Buffalo, NY and we NEED the defroster to work in the winter! thanks for any help.