Dead Neon HVAC: Failed Sensor Leaves Cabin Airless

Last month my 2005 Dodge Stratus had a similar HVAC sensor failure. The auto recirculation system completely stopped responding, matching your symptoms. The main issue was traced to corroded wiring connections at the cabin air sensor, causing the entire blower system to fail. The repair involved: Testing the AUC sensor functionality, Replacing damaged wire connectors near the blower motor, Cleaning corrosion from the main HVAC control module pins, Verifying the cabin air sensor signals This was a moderate repair that took about 3 hours to complete. The wiring harness deterioration was more extensive than initially apparent, requiring careful tracing of multiple connections. The blower motor itself was fine, the problem centered on the signal pathway from the cabin air sensor to the control module. Most shops should be able to handle this repair if they have experience with automotive HVAC systems. The key is proper diagnosis of the sensor circuits before replacing major components. Given your mileage, checking the wiring connections first makes sense before changing the blower motor or control module.

Thanks for sharing your experience with the Stratus. That sounds exactly like what Im seeing with my Neon, the air quality sensor and auto recirculation completely dead. I ended up having similar wiring issues near the AUC sensor. Definitely reassuring to hear it wasnt the entire blower motor that needed replacement. Can you remember roughly what the repair cost in your case? Also curious if youve had any other sensor fault issues pop up since getting it fixed? My main concern is making sure all the corroded wiring gets properly addressed the first time around.

I paid 95€ for the repair at the shop, which mainly involved fixing faulty wiring connections at the cabin air sensor. Since getting the AUC sensor issue resolved, the auto recirculation system has worked perfectly with no new fault codes. Most importantly, they found and fixed all the corroded wiring during the initial repair. The fix focused on the air quality sensor wiring rather than replacing the entire component. The HVAC system and blower motor response have been reliable since the repair. No issues with the air conditioning sensor or any other related components have emerged in the months following the fix. If your symptoms match what I experienced with the Stratus, having a technician check the wiring connections around the cabin air sensor would be a good starting point. The repair cost should be similar if its just the wiring causing the fault.

I took my Neon to a local HVAC specialist after reading about your experience. The repair was surprisingly straightforward and cost 80€ total. The technician confirmed the climate control issues stemmed from corroded wiring near the air quality sensor, just like in your case. The repair process went smoothly: Found damaged connections at the AUC sensor, Fixed 3 corroded wires, Cleaned the sensor contacts, Tested all HVAC functions Everything has worked perfectly for the past 2 weeks. The auto recirculation responds immediately now, and no sensor fault codes have appeared. Really glad I didnt replace the entire blower motor unnecessarily. Thanks for pointing me in the right direction with the wiring check, saved me both time and money.