Just recently, my rear AC/Heat decided to get stuck on the heat setting. It has dual climate control and I have played with all versions of the settings to see if it will switch over and it stays on heat. I checked all the cabin fuses and the ones under the hood and they seem fine.

Another intresting point is that it gives out heat through the lower section and is not affected by switching to a cooler setting. No air comes out of the upper a/c ducts.

Any ideas?

 

I have the same problem. Did you find a fix??

 

the other day hot air started comming from my vents. The A/C was working fine earlier that day and I think I had just turned off the snowflake because the van was cooled off inside and I just wanted to let the cool air continue to blow. All of a sudden HOT air started blowing from the vents even with the temp slide all the way to the left. It seems like the heat is stuck "0n" and when I turn on the A/C it cools off a little bit as if the A/C was fighting to overcome the heat at the same time? The engine temp is normal and the A/C compressor is working and the lines under the hood are getting cold. Anybody have any ideas on what to do with this problem??

 

Welcome to DF
If you have a/c gauges, you need to hook them up and post your reading. You may have a plugged H-valve/expansion valve.

 

you can also go to the diy section and perform the actuator calibration / diagnosic test and see what you get.