'03 LS 3.4 v6, automatic, FWD. replaced resiter twice, went out within 3 days of each other. air will only come out of the vents by turning the setting to 5, then it blows you away. with the **** turned to other settings, nothing happens, no sound, no air, no nothing.and the tranys been skipping a bit. it seems to want to speed up when my foots off the gas. any ideas ?

 

vaccuum line?