Buick Park Avenue HVAC System Dead, Climate Sensor Fix

Had a similar issue with my 2010 Buick LaCrosse last winter. The climate control system showed identical symptoms, no response from auto temperature controls and AC failure. After sensor diagnostics, it turned out the HVAC sensor wiring harness had deteriorated, creating a faulty connection to the control module. The temperature sensor itself tested fine, but the cable connection needed complete replacement due to corrosion. This is actually a common issue in these Buick models after 100k miles. The repair required removing part of the dashboard to access the wiring harness assembly. It was a moderate repair job, not something for basic DIY unless you have experience with HVAC systems and electrical diagnostics. The job took about 3 hours in the shop. While not a critical safety issue, leaving it unfixed can lead to complete climate control failure and potential damage to other HVAC components. Based on your description, recommend having a certified shop check both the sensor and wiring connections before replacing any parts. The stored error code should help narrow down whether its a sensor problem or connection issue.

Thanks for sharing your experience with the HVAC sensor replacement. My car had similar temperature control issues last year. After getting it diagnosed, the problem was fixed with a new temperature sensor and harness update. Would you mind sharing what the total repair cost was for your LaCrosse? Also curious if youve had any climate control problems since the fix? My repair has held up well so far but always good to know what to watch for.

The repair job on my LaCrosse was completely successful. The mechanic found the faulty interior temperature sensor was causing the climate regulation issues, and fixing the cable connection resolved everything. Total cost came to 95€ for the wiring repair, which was actually less than expected for a climate control system problem. Since getting the sensor replacement and connection fixed, the temperature reading has been spot-on and the HVAC sensor system works perfectly. No issues with the climate control for over a year now. The auto temperature settings respond correctly, and the overall climate regulation is working just as it should. The key was catching it early before it could damage other components of the HVAC system. Based on both our experiences, these temperature sensor connection problems seem pretty common in these Buicks, but once properly repaired, they tend to stay fixed.

After dealing with my climate control problems, I finally got the car fixed today. The mechanic confirmed it was indeed the HVAC sensor causing all the trouble. They found the temperature sensor had completely failed, and the wiring was showing early signs of wear. The total repair came to €280, €150 for the sensor replacement and €130 for labor. The mechanic actually showed me the old sensor, and it was pretty corroded. They also cleaned the surrounding connections while they were in there to prevent future climate issues. The whole job took about 2 hours, and I can already tell a huge difference. The automatic temperature control is responding perfectly now, and the AC is blowing nice and cold. Really glad I got it taken care of before summer hits. For anyone else facing similar climate control problems in their Buick, definitely worth checking the sensor first. The diagnosis was quick and the fix was straightforward. Way better experience than my last mechanic, who wanted to replace the entire control module without even testing the sensor.