While driving city streets in a snow storm, i was unable to defrost the rear window and melt the snow off of the heated side view mirrors. i literally couldn't see anything behind or next to me. when i press the defroster button the light indicates that it's on but nothing happens. there were no warning indicators illuminated. i took the vehicle into the dealership twice for this problem and they said that both the rear window defogger and heated mirrors work off the same button and needed to be reprogrammed - but it never seems to work when i truly need it.
A/c never blows cold. only heat, the defogger doesnt work properly as a result.
Tl* the contact owns a 2010 buick lacrosse. the contact stated that the defroster failed to defrost the front windshield. the contact also stated that the entire instrument panel continuously illuminated. in addition, the heater control knob failed. the failure occurred on several occasions. the vehicle was not diagnosed or repaired. the manufacturer was not notified of the failure. the approximate failure mileage was 84,000.