first of all my rear window defogger didn't work because the clip where the wire connects to came off the window. they repaired it back in january and 2 weeks later it came off. i waited til i got more miles on it to get all of the warranty issues taken care of at the same time. since they fixed the clip againit seems to be done properly and i don't think it will come off. if your rear window isn't defogging check to make sure the clips on each side of the window are not only firmly connected but also thet they are secure to the window as well. btw the defroster switch on the a/c control panel turns on the mirror warmers as well. i checked both the other night, turned it on...left it on about 5 minutes then felt the back glass and it was quite warm. also the mirrors were warm as well. make sure your grid lines on the back window have no breaks. is your baby under warranty? it should get quite warm within a few minutes.the seat heater issues is another thing. just before the driver seat wuit working it would get really hot. like uncomfortably hot, even at low setting. they replaced the heating element in the seat and it works fine. hope this helps....benji