No heat on the rear vents

[the maxwells]

What to do if your At4 isn't blowing any heat to the rear vents? the front ones work perfectly fine. The fan speed and vent controls all seem to be working normally.

I'm trying to figure out what's going on here. any advice on what to check or how to fix this would be super helpful! Thanks!

 

[WashingtonsGhost]

My money is on a rear blend door actuator issue. I once had a similar problem with a family SUV where the rear zone would just stay stuck on cold, no matter what. It was a real pain in the neck until I figured out that little motor had given up the ghost.

It controls whether heat or AC gets directed to the back, so if it's not moving, you're out of luck. Sometimes they make a clicking noise when they go bad, but not always. You may also want to confirm the rear vents aren't just closed by mistake which happens more often than you think!