It looks like the actuator is “fairly” easy to replace for the air inlet door. I’m probably going to try that and if that doesn’t make a difference then start looking at the blower motor control module or FCIM. Thanks for the diagram. This is a great help!

 

It's the amount of monitoring by the computer for the "manual" system that's interesting. I've always thought that my truck's manual A/C had to have some sort of electronic controls because when the temperature is mild the A/C doesn't blow as cold as when it's very hot. This proves it. Even though it's manual the computer is getting information from the in vehicle temp and humidity sensor, ambient temp sensor and discharge vent temp sensors and determining that 50 degree air is good enough on a 70 degree day to cool the cabin. It would help fuel economy since the compressor isn't engaged as much. But on 95 degree days it allows maximum output and will blow out 36 degree air from the vents.

I guess the manual system isn't as manual as it seems.

 

and my 13 has been just the opposite, when temps and humidity are up, the ac barely works. I recently changed the AAT on a whim. It was only 7 bucks plus or minus. Oddly, after 8 years, the ac is actually working better. I am guessing that the Autolamp/Sunlight sensor on the dash, may also be a culprit. Something, I assume others in this year with same issue, is keeping the AC from correctly cycling at 36-38 degrees.

 

It tells the automatic system how intense the sun is shining to adjust the system to compensate. 40 degrees at night requires more heating than 40 degrees on a bright sunny day.

On my old Acura one of the best things about it was it used information from the navigation's GPS sensor to determine the position of the car in relation to the sun. If the sun was shining in the driver's side window it automatically used the dual zone system to blow colder air out of the drivers vent. Going around a interstate clover leaf as the sun rotates around the car you could hear the blower ramping up as the car started facing the sun as the system compensated for the sun shining directly in the windshield.

 

Does it have more influence than the other two: Inside Air temp/Humidity sensor and Evap Temp Sensor?

 

No it shouldn't be. The most dominant sensor would be the inside temperature sensor. This is what tells the computer how far the cabin temp is from the set temp. Meaning if the the system is set for 70 degrees and the cabin temperature is 120 the computer is going to go to full cold, recirculate and max blower speed to cool it down regardless of how dark it is. An example of this would be starting it up on a 100 degree day in a parking garage. The sun load sensor is going to tell it there is very little light and the Autolamp system will turn on the headlights. The HVAC module will also see it's dark but because its very hot inside and outside the cabin it will still select max A/C. As the cabin temp gets closer to the set temp then it will adjust the system according to data it's getting from the other sensors like the sun load sensor.

 

I watched a video that showed what appeared to be a 2016 and the air inlet door actuator was accessible by removing the radio. It either wasn’t a 2016 or my 2017 is different. I pulled the radio and CD player and cannot see the actuator. Maybe I can see one corner of it and a screw. In any case it looks like the dash will need to be removed. I guess I’m off to visit the dealer.

Thanks for for the Help!

 

Did you ever get a resolution for this?