have a Chrysler Sebring sedan 2001 the air has a mind of it's own . Rarely works right then for no reason at all air will only blow from defrost . A mechanic has repaired blower motor , replaced heat/cold actuator , and replaced Ac control panel ....any thoughts ???I tried the diagnostic , turned air on cold , defrost mode then held down defrost button til chimed ... At first blinked 00 then 48 any idea what 48 means ?