Boca Auto Care: Why Your 2022 GLC300 AC Might Struggle in Extreme Heat

A Las Vegas driver recently raised a concern that might sound familiar to some Mercedes-Benz GLC300 owners: the air conditioning system acting oddly in high temperatures. The driver reported that a year ago, a Mercedes dealer mechanic performed a sensor recalibration on their 2022 GLC300, but didn’t replace any parts.

While the fix seemed to help slightly, the cooling behavior still felt inconsistent, especially on scorching summer days.

The driver, who sets their climate control to around 80 degrees to avoid getting too cold, noted that the issue isn’t about weak cooling, it’s about the system either freezing them out or not keeping steady. This is the opposite problem from what many drivers expect. In fact, another commenter on the same thread joked that they’d go crazy without climate control in a rental car, underscoring how sensitive modern drivers are to cabin comfort.

If you own a 2022 GLC300 and notice your AC seems to overcorrect or struggle to maintain a consistent temperature when it’s over 100 degrees outside, you’re not alone. At Boca Auto Care, we’ve seen similar complaints and recommend a thorough diagnostic that checks not just refrigerant levels but also the blend door actuators, ambient temperature sensor, and the climate control module software.

Sometimes a simple recalibration isn’t enough, and updated software or a sensor replacement is needed to restore reliable performance in extreme heat.