I added a heated seat kit to my 08 Acadia this past winter and have been trying to get some info as to what is normal. The dealer doesn't seem to be able to find any answers for me. Everything works fine till I try to use just the heated seat backs (top part of toggle switch). They operate for about a minute then shut off. Both drivers and passengers side do the same thing. The bottoms and the backs together seem to work fine (although I'm still not convinced the backs are working 100%). Does anyone with heated seats know if this is the way they work? The dealer is testing out Acadia's and Enclave's as they come in the shop but so far he's batting 50/50. Some seem to work like mine do and others stay on till the seats are turned off with the switch. Can anybody offer some insight for me?