Sensors: Electrical device that measures the different performance parameters of the car.
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They are used to measure the air pressure, the temperature, the speed, the liquid level, the characteristics of the exhaust smoke, etc. They are connected to the ECU (Electronic Control Unit) and they provide the information needed to improve the engine's performance.
Hello Jaime, the AC gas official specification for the Ford Transit 350 2017 is R-134a, 1.76 lbs (0.79 kg) in total w/o Rear Heating Ventilation.
Its 2.62 lbs (1.18kg) if it has rear ventilation.
@RupertThe manual shows one A/C pressure transducer, rather than separate high- and low-pressure sensors. Its mounted on the refrigerant line near the condenser, low at the front of the vehicle. Access is from underneath, after removing the shields. On the first numbered image, its item (5). The second image is a close up of the sensor. The transducer measures discharge pressure and reports it to the PCM.