There are also other reasons why a normally functioning AC controller and damper box would deliver cold air to the driver side only, (only if it's in dual climate mode though). There is a temperature sensor on the dash on the driver side, it's right about where your right knee is. There is a little "vent" about the size of a quarter that has a temp duct sensor, if that sensor fails and is saying the driver side is 175 degrees F it will always try to cool down the driver side.

This would only affect function in dual climate mode though, if you have driver/passenger sides locked it will not independently control the temp selector.

If you can't figure out the issue I would take the car down to Nissan/Infiniti for a 1 hour diagnostic, they can plug in their Consult-II/III dealership tool to run an even more comprehensive diagnostic and will have the EXACT ROOT ISSUE discovered in about 15 minutes, it's going to cost you a 1 hour diagnostic minimum charge though.

 

Was there ever a resolution to this? Sara, did you take it in? What was the cause/fix for it?
I have tried looking for others with this problem but it doesn't appear to be very common.

 

Are u also only getting cold air only on one side of the car?

 

Well, for me if i run the heater, only the passenger side gets warm and the driver side stays cool. If i run the AC, only the passenger side is cold while drivers side stays warm.
Also, I'd like to note we have checked the obvious [ie verified the heat controller is in dual mode, not driver/passenger independent, verified the vents are open, it also seems to me the proper amount of air is being pushed through the vent]
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The only way I can see that happening is if the mixer door was stuck in one position.

 

That's what I was thinking. And at this age, all the little foam seals at the doors are becoming brittle. Occasionally I'll get some blowing out...little black foam bits.

 

Ive been getting those foam bits too haha.