Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Refrigerant Temperature Sensor
A refrigerant temperature sensor (a temperature sensor without pressure evaluation) is currently not installed in Volkswagen/Audi.
Switching pressures, moving and installing switches as well as switch arrangement and version. Use the Vehicle Diagnostic Tester in the A/C system "Guided Fault Finding" function. Refer to REFRIGERANT CIRCUIT (R1234YF 2 OF 3) , or REFRIGERANT CIRCUIT (Climate control) , or REFRIGERANT CIRCUIT (R1234YF 3 OF 3) .
- The refrigerant temperature sensor (with temperature-dependent resistance) is installed, for example, in the high pressure line in vicinity of the A/C compressor.
- In the refrigerant circuit, there is a direct correlation between temperature and pressure. Should there be too little refrigerant in the refrigerant circuit, the temperature in the refrigerant circuit increases more steadily on the high pressure side than intended for this pressure when the A/C system is operating.
The cosponsoring control module for example the Front A/C Display Control Head -E87- or the Climatronic Control Module -J255- evaluates the pressure and temperature in the refrigerant circuit and switches the A/C compressor off if the temperature exceeds the value that was stored for this pressure. Use the Vehicle Diagnostic Tester in the A/C system "Guided Fault Finding" function. Refer to REFRIGERANT CIRCUIT (R1234YF 2 OF 3) , or REFRIGERANT CIRCUIT (Climate control) , or REFRIGERANT CIRCUIT (R1234YF 3 OF 3) .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.