The heat went out in my wife's 05 Equinox last winter. Fortunately, we live in Houston and winters are generally mild an don't last that long. I am pretty sure it's the blend doors like all the others I have heard about. Has anyone else had this issue? What did you do to get it fixed? How much was it? I have had quotes from $800 to $1300 for the labor to replace this $45 part. Any help appreciated.