Where is the Audi A4 air conditioning pressure sensor located?
2 Answers
Audi A4 air conditioning pressure sensor is located on the air conditioning pump. Below is relevant information about the sensors: 1. Interior temperature sensor: Usually installed under the instrument panel, it is a thermistor-type temperature sensor with negative temperature coefficient characteristics, used to provide the air conditioning electronic control unit with temperature signals from inside the vehicle cabin. 2. Exterior ambient temperature sensor: The exterior ambient temperature sensor is also a thermistor-type temperature sensor with negative temperature coefficient characteristics, typically installed on the lower side of the vehicle's front bumper, used to provide the air conditioning electronic control unit with temperature signals from outside the vehicle cabin.
I've been driving an Audi A4 for over 10 years. The air conditioning pressure sensor is usually hidden in the engine compartment, especially near the AC compressor. That small black box is fixed on the high-pressure or low-pressure pipeline, with an electrical connector attached nearby. The sensor monitors pressure to protect the system. If it fails, the AC may stop cooling or fluctuate between hot and cold. Once when my A4's AC had issues, it turned out to be the culprit. It's located near the compressor on the right side of the engine bay—just unscrew the cover to see it, but don't attempt DIY removal as refrigerants (like R134a) are hazardous and require professional tools for evacuation. I recommend checking this area during routine maintenance to ensure the wiring connectors aren't loose. Although its location is obvious, it's safer to have it handled at an authorized 4S shop.
