Cold air blowing on top and hot air on bottom

[moostangyae]

2005 LJ. I have cold air blowing in the top registers and hot air blowing on the bottom when the A/C is on. The actuators are working fine and no vacuum leaks and no sign of a broken lever. Suggestions?

 

[Steel City 06]

Mine does that when the temperature control is set to mix hot and cold. The HVAC does a poor job of mixing the air. If it's happening on the full cold setting, your blend door may not be sealing off the hot air flow completely

 

[moostangyae]

Mine does that when the temperature control is set to mix hot and cold. The HVAC does a poor job of mixing the air. If it's happening on the full cold setting, your blend door may not be sealing off the hot air flow completely

How do I get to the blend door? And open it up. Looks like a major pain.

 

[Steel City 06]

How do I get to the blend door? And open it up. Looks like a major pain.

I've never done it myself. I suspect it involves a full removal of the dash. Which is in fact a major pain.
You could always plumb in a heater core bypass which would stop the heater from generating heat when the valve is shut. Still not ideal but it could reduce the amount of heat coming into the cabin

 

[nk24]

I have this issue on my 04 TJ as well. Nice cold air up top, slightly warm air coming from below. Planning to fully investigate this fall when it cools down a bit.

 

[Chris]

I've had this on both of the TJs I've owned.

I always assumed it was normal, but it may be a stuck blend door.