Jetta Hybrid Temperature Sensor Kills AC Function

The temperature sensor malfunction you describe matches what happened with my 2012 Passat Hybrid. The HVAC system showed similar symptoms, error messages and non-functioning AC. This turned out to be a serious issue requiring professional diagnosis. The engine cooling system was affected due to a faulty temperature sensor that needed replacement and sensor calibration. The main control unit was also compromised, which explained the error messages in the instrument cluster. The repair involved: Complete diagnostic scan, Removal and replacement of the temperature sensor, HVAC system recalibration, Testing of the engine cooling system, Software update for the climate control module This is not a DIY job as it requires specialized diagnostic equipment and proper sensor calibration tools. Without proper repair, it can lead to more severe engine cooling issues and potential damage to the hybrid system components. Based on the symptoms described, your car likely needs similar intervention. Would recommend having it checked by a certified dealer or specialist with hybrid experience, as generic shops often lack the proper diagnostic tools for these systems.

Thanks for the detailed response. Did you remember roughly how much you paid for the full repair? My temperature sensor seems to be showing the same symptoms as yours. Since getting it fixed, have you noticed any other engine cooling issues or temperature gauge problems? Just want to make sure I budget correctly and know what to expect before taking it to the shop.

The repair was definitely worth it, fixed all the temperature sensor malfunction issues I mentioned earlier. Total cost came to 980€ for the air conditioning control unit replacement. The temperature sensor heat exchanger defect was identified and corrected as part of the repair. Since getting it properly fixed, the HVAC system has worked flawlessly. The engine cooling performance returned to normal and the temperature gauge readings have remained stable. No more error messages or sensor calibration problems over the past months. My advice would be to budget similar to what I paid, though prices can vary. The important thing is getting the complete diagnosis and repair done at once, rather than trying partial fixes that might need revisiting later. A properly working cooling system is crucial for the hybrid components long-term reliability.

After checking several shops, I finally took my Jetta to a certified dealer. The diagnostic scan confirmed it was indeed a faulty temperature sensor causing the HVAC system issues. The total repair came to 890€, which included replacing the sensor and recalibrating the engine cooling system. The vehicle maintenance process took about 6 hours. They found an additional small leak in one of the coolant hoses which they fixed under warranty. Really glad I caught this early before it caused more serious damage to the hybrid components. Its been 3 weeks since the repair and everything works perfectly now. No more error messages, the AC blows cold, and the temperature gauge shows normal readings. The engine cooling system is performing much better than before. For anyone else facing similar issues, definitely worth getting it checked by specialists who understand hybrid systems. The peace of mind knowing its properly fixed is worth the investment.