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I set the temperature to 78 degrees (57 outside) and the AC still wants to send cold air into the cabin. It stops doing that when I set it to 80 degrees and above. I'm thinking the cabin air temperature is feeling hot for some reason. Where do I find it (in a 07 TLS)? Can I clean it or whatever to make it work better?
Sensor is located under the steering wheel, one the right. You can see cutouts in plastic trim.
If you are in "Auto" car will use AC to remove moisture from air that goes into the cabin. When it's cold outside it shouldn't blow any air until engine warms up.
Before reading out that sensor, you may want to run self-diagnostics on the HVAC system. A "sticky" climate control response could be failed air mix control motor(s).
This was my exact problem and I just followed the steps in this post about a month or so ago. Completely fixed, heat works perfect. I cleaned and regreased the gears on motor that controls the cable to the heater valve with super lube grease and I also replaced the cable, like $7 from the dealer.