Dodge Ram HVAC Sensor Causing AC Shutdown

Had the same sensor malfunction in my 2010 Dodge Dakota last summer. The temperature sensor failure affected the entire cooling system performance and triggered constant error codes. The root cause was a faulty heat exchanger unit that damaged the temperature sensor. When the sensor fails, the vehicle maintenance system cant properly regulate cabin temperature or engage the AC compressor. This requires both sensor calibration and potentially replacing components of the HVAC control module. In my case, the repair involved: Diagnostic testing of the HVAC control module, Replacing the faulty temperature sensor, Installing a new heat exchanger, Full system calibration, Pressure testing the entire AC system This isnt a simple fix-it-yourself job since it requires specialized diagnostic equipment and proper sensor calibration tools. The repair was quite extensive and took 2 full days at the shop. Would strongly recommend finding a certified mechanic who specializes in HVAC systems, as incorrect repairs can lead to additional component failures. The temperature sensor issue is a serious problem that will not resolve itself and could potentially damage other parts of the engine cooling system if left unaddressed.

Thanks for sharing your experience. Your repair sounds exactly like what Im dealing with on my Ram. The HVAC system problems and sensor calibration needs match my symptoms perfectly. Do you remember roughly what you paid for the complete repair? Just curious about the cost since it seems like quite an involved job. Also wondering if youve had any other cooling system issues pop up since getting it fixed?

Thanks for asking about the costs. After taking my Dakota to a certified mechanic, the complete repair totaled 980€ for fixing the defective air conditioning control unit. The temperature sensor heat exchanger that was causing problems has been working flawlessly since the repair six months ago. The engine cooling system has been performing perfectly with no temperature gauge fluctuations or error codes. The HVAC system maintains consistent temperatures now, unlike before when it would act erratically. Getting it fixed by a qualified technician was definitely worth the investment to prevent further damage to related components. The repair cost might seem substantial, but considering the complexity of the work and the specialized diagnostic equipment needed, its actually reasonable. Most importantly, having it done right the first time means no recurring issues with the sensor malfunction or cooling performance.

I finally took the plunge and found a new certified mechanic who specializes in HVAC systems. The total repair came to 1150€, which was slightly more than expected but worth every cent. The cooling system diagnosis revealed exactly what you described, a failing temperature sensor and damaged heat exchanger that needed complete replacement. The repair took about two and a half days but the attention to detail was impressive. They performed full sensor calibration testing and showed me the faulty parts. The HVAC system is now working perfectly, no more error codes or temperature control issues. Really glad I didnt go back to my previous mechanic. Having a proper diagnostic workup and repair by someone who actually knows these systems made all the difference. The sensor malfunction is completely resolved and the AC blows ice cold again. Sometimes paying more for quality work saves money in the long run.