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In the Lexus RX350, you can turn off the air conditioning by pressing a button on the main console. If the car is experiencing issues with its climate control system, there are a few possible causes. A faulty blend actuator motor would prevent you from adjusting the air temperature or airflow intensity. A malfunctioning fan motor would result in poor air circulation, though you might still hear noise when it's turned on. If nothing is working, it could be due to a blown fuse. You can locate the fuse box under the hood or to the left of the steering wheel. Fuses are easy to replace, so it's a good idea to check them first. Additionally, a malfunctioning temperature sensor near the fan motor could lead to erratic behavior from the actuator and inaccurate temperature readings.
The Lexus RX 350 comes with the air conditioning controls located on the main console dashboard, so you'll want to press the off button there.