Originally Posted by revesalex

Hi All,
Thank you for the replies. I'll see if I can get a scan tool in there to see if there are any codes. I currently do not have a check engine light.

As an update, today a similar thing happened. Got in my car to go to lunch and the AC wouldn't turn on. It was hot outside, however, it started to rain and the temperature dropped. It went from 82 degrees to 75, and the AC Compressor turned on putting out cool air. What I did notice this time is that the driver side vents were blowing cool air, the passenger side was not. Adding that to the list of things I noticed:

• A/C fuses were fine.
• Compressor nose/clutch rotated by hand. Was not stiff, but also was not loose.
• Interior fans were able to engage/disengage, change from recirculation to outside air.
• There was refrigerant in the lines, no leaks.
• Something I did find pretty interesting was that when switching from recirculation to outside air, the recirculated air was actually much warmer than the outside air. Found this out while driving. Put the windows down so that the recirculated air is the same as the outside air, and it was still hotter than putting the system into outside air mode.
• AC works when ambient temperature is below 80.
• When AC is actually on, driver side vents blow cool air, passenger side does not. This happens with dual mode either on or off.

Again, any help is appreciated. Tonight I'll see if I can get an OBD reader in there even though I do not have a CEL. I read somewhere there is an AC diagnostics test that the car can run and return codes, I'll see if this is possible for my model (2013 GS350). If the AC compressor turns on ill take a look at the sight glass. At this point I'm thinking it's an evaporator issue, blower motor issue, or a sensor issue.