Question for Kuhl Carbon:

[Kühl Carbon]

This seems to be a good aftermarket add on for cold buns. I have had custom interiors added to several of my vehicles ... as a matter of fact, my current vehicle is the only thing I have owned in the last 20 years that has retained it's factory interior. Any reputable trim shop should be able to disassemble your seats, install the heaters, and reassemble them in a couple of hours, tops. No unstitching or restitching should be required.

Most good trim shops have a good source for bun warmers if you live in the ice belt like I do. Most of them do a pretty decent job of heating and are good from a durability standpoint too. Most of them are OEM suppliers ... a company won't usually just go out and say "We are gonna make some aftermarket bun warmers". Development costs would be too high ... unless some OEM has already paid you to develop them and you are simply gonna retrofit the same unit into other vehicles.

GM bun warmers do indeed seem to get excessively hot. What the second link you posted may mean though, is the interface is based on a GM harness and connector. Your H2 would have come with all the wiring for bun warmers, just not the heating elements and the switch. Most OEMs do this to keep costs down. It is cheaper to give everyone the same wiring harness as opposed to sequencing two different ones into the plant .... seems strange I know.

I hope this answers your question.

Founding member of the "No Hummer Krew"