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I continue to have this issue as well. This is super annoying. Can't pinpoint it for the life of me, but it is certainly something that only happens after you drive it for 10 to 15 minutes. I am due for a cabin filter change so I'm going to try that solution and report back if it helps me any.
Does this sound like your symptom?

Quote: n. The HVAC blend door motor / air door actuator directs the flow of air in the vehicle’s cabin. If the motor burns out or the shaft cracks, the “door” can get stuck in one position, leading to improper ventilation

Here is the part: Part Number: 27732-A070A

Good luck!
 

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Does this sound like your symptom?

Quote: n. The HVAC blend door motor / air door actuator directs the flow of air in the vehicle’s cabin. If the motor burns out or the shaft cracks, the “door” can get stuck in one position, leading to improper ventilation

Here is the part: Part Number: 27732-A070A

Good luck!
Appreciate the input. I have asked my dealer about this specifically and cannot get a straight answer. Do you know if the blend door motor / actuator fails, will it resent itself and fail over and over? Seems many of us have the issue where the blower is blocked after a period of time but if you let the car rest, say for an hour, it will resent and be open allowing air to flow for a little bit before closing again.
 

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Appreciate the input. I have asked my dealer about this specifically and cannot get a straight answer. Do you know if the blend door motor / actuator fails, will it resent itself and fail over and over? Seems many of us have the issue where the blower is blocked after a period of time but if you let the car rest, say for an hour, it will resent and be open allowing air to flow for a little bit before closing again.
I cannot really say because I've yet to experience this HOWEVER there seem to be two issues in this thread.
Issue #1 Blower is blowing, but air is not coming out of the vents
Issue #2 Air stops being either cold or hot after driving at high speeds for 15 minutes give or take.

If you are experiencing Issue #1 that function is the responsibility of the blend motor and door. If its #2 then I do not know what you'd need... But it sounds like a faulty thermostat (if heat stops) or faulty evap core/compressor (if cold stops)
 

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I cannot really say because I've yet to experience this HOWEVER there seem to be two issues in this thread.
Issue #1 Blower is blowing, but air is not coming out of the vents
Issue #2 Air stops being either cold or hot after driving at high speeds for 15 minutes give or take.

If you are experiencing Issue #1 that function is the responsibility of the blend motor and door. If its #2 then I do not know what you'd need... But it sounds like a faulty thermostat (if heat stops) or faulty evap core/compressor (if cold stops)
@mikedexion - thanks for looking this up for us. It could be our issue, but I just wanted to clarify that I believe issue #1 and issue #2 are a single issue.

Car starts up and heater or AC are operating normally. After 15 minutes, the blower continues to run and sound like it is blowing and yet no air (hot if running heater or cold if running AC) comes out if the vents. If you park the car and let it rest and start up again, heater or AC operate normally, meaning you hear the blower and air at comes out if the vents. Again you drive for 15 minutes and air just stops coming out the vents but you can hear the blower fan operating.

Now when I've experienced the issue and got parked in the garage, while the car is running and the blower is running and NO air is coming out of the vents, as i change the air from straight to floor to defrost I do hear the noise of some doors moving inside if the vents. A motor is switching the air direction and yet no air comes out of any of the vents straight (dash), floor or defrost (by front windshield). If i turn off the car and let it rest, when i turn it on, air is blowing out if the vents as expected. Until i get to driving for 15 min...

Hope the detail helps someone out there narrow it down.

Thanks for looking things up and trying to help out. It is appreciated.
 

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@mikedexion - thanks for looking this up for us. It could be our issue, but I just wanted to clarify that I believe issue #1 and issue #2 are a single issue.

Car starts up and heater or AC are operating normally. After 15 minutes, the blower continues to run and sound like it is blowing and yet no air (hot if running heater or cold if running AC) comes out if the vents. If you park the car and let it rest and start up again, heater or AC operate normally, meaning you hear the blower and air at comes out if the vents. Again you drive for 15 minutes and air just stops coming out the vents but you can hear the blower fan operating.

Now when I've experienced the issue and got parked in the garage, while the car is running and the blower is running and NO air is coming out of the vents, as i change the air from straight to floor to defrost I do hear the noise of some doors moving inside if the vents. A motor is switching the air direction and yet no air comes out of any of the vents straight (dash), floor or defrost (by front windshield). If i turn off the car and let it rest, when i turn it on, air is blowing out if the vents as expected. Until i get to driving for 15 min...

Hope the detail helps someone out there narrow it down.

Thanks for looking things up and trying to help out. It is appreciated.
Ok, that sounds like the blend actuator or door is not functioning properly. Air being routed through the vents is the responsibility of that part. If the blower is blowing but air is not coming to you, I don’t see what else it could be. I’d first start by replacing that part.
 

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I think we are getting closer to the issue. Take a look at the Pathfinder thread I found, same issue as the QX60. It seems the AC Auto Amp is failing and causing the evap coil to freeze up and block the airflow. Makes sense that when you let the car "rest" it resets itself. My regular mechanic thought this was the case but couldn't trace the issue.

In the thread, the 2014 part fixes the issue while the 2015 issue does not. I think this is a manufacturer issue and is not just normal wear and tear. No wonder any good mechanic could not figure it out, it's the wrong part!

 

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I think we are getting closer to the issue. Take a look at the Pathfinder thread I found, same issue as the QX60. It seems the AC Auto Amp is failing and causing the evap coil to freeze up and block the airflow. Makes sense that when you let the car "rest" it resets itself. My regular mechanic thought this was the case but couldn't trace the issue.

In the thread, the 2014 part fixes the issue while the 2015 issue does not. I think this is a manufacturer issue and is not just normal wear and tear. No wonder any good mechanic could not figure it out, it's the wrong part!

If you're trying to narrow down the list of possible causes that should be an easy one to rule out if it's not the issue. A frozen evap coil turns into a block of ice. If after "resting" it is working again that means it would have had to have melted enough to stop impeding the airflow. You'd notice a significantly large puddle under the car after the rest period if this was the issue, as the melted ice would have to drain. Next time this happens to you check for the puddle underneath, if there's no puddle feel your carpet to see if it's wet. If there's no puddle and no wet carpet your evap coil is not frozen. If the carpet is wet your evap drain line is plugged. The most common cause of a frozen evap coil is a clogged drain line, both on cars and all hvac units.
 
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