Rear Air not controllable?

[sfollenius]

Hi All, when I enable rear air the temp control knob in the rear does nothing? Is this correct? I have tried multiple searches and have mostly found folks with problems referring to the A/C staying on when the car is turned off, this is not my problem. They reference changing relay and TSB 07-008/09. I can control the fan speed in the rear when the rear air is "turned on". The seems mostly cool coming out of the top vents, the bottom vents do tend to blow warm air, but again have no effect with rear temperature control.

Do I need to replace a relay?

 

[ceric]

There is a button at the front center dash to enable the rear control.
Was that on when you try the rear knobs?

 

[table5511]

Rear blows from floor only (bottom vent) unless rear temp is all the way cold, then it will blow from the upper vents. stupid design.

 

[sfollenius]

Yes, I enable rear control, the light in the rear illuminates as well. I can't figure out what the temperature setting in the rear even does. Nothing happens when I change it, either from cold to warm, the air temperature out of the lower vents stays the same and the air temperature out of the upper vents (if on) does not change. Its like the rear temperature control does nothing

 

[sfollenius]

I just did some experimenting. Put it on Auto on front, enabled rear control. Auto 60 degrees driver and passenger, ice cold air blew out of upper and lower vents, perfect. In rear, no air out of top vents, only lower vents, and was WARM air, not hot air, not cool air, but Warm. The temperature setting had no effect on cold or hot, but the fan speed would work fine. I could make it blow harder or lower or even off in the rear using that control. When I turn off rear air control the air would blow out of upper rear vents ONLY, ice cold air.

With heat I set front to 90 degress, enabled rear control. Air was warm-cool out of lower vents, nothing out of upper in the rear. The air was definately not as warm as that coming out of front lower vents. Again, the temperature control made no difference in the rear on both the warmest and coldest setting, but again, I could control the fan speed for the lower vents from the rear. When I disabled rear controls the air was nice and toasty like that in the front vents, came just out of lower like it was supposed to.

Very weird to me!

 

[sfollenius]

Can anyone confirm how the rear air temperature control works?

 

[mayday188]

I have been trying to figure the same question myself. My wife's vehicle does the same exact thing, what is the temp control on the back of the console for? You would think that it would control the temp to the rear compartment not just let cool air blow. Has anyone figured it out completely? Or has everyone just received post saying they are stupid and should have read the owners manual which makes no since. I would appreciate a clear answer if anyone can give one. If its a flaw from the manufacture, ok thats fine. Someone just tell us thats what it is. Then maybe everyone will quit asking the same question over and over.

 

[paulvha]

My CX-9 ( 2007) only has ONE Cabin temperature sensor (which is located in the front, driver side, half down on the right hand side). Reading the manual, it looks the rear control be applying correction to the front control setting: "while in individual operation mode, the temperature setting is controlled at the driver's temperature" and is to react to opposite to what to expect " when selecting heat, the system will restrict airflow until it has warmed to prevent cold air from blowing out of the vent".