GLE Coupe C292 A/C Only Blows Cold Air at Lo
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Newbie
Joined: Jan 2024
Posts: 6
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2016 GLE450 AMG Coupe
GLE Coupe C292 A/C Only Blows Cold Air at Lo
Hi all,
My GLE C292 coupe has an AC problem these days. It only blows cold air when the temperature is set to be the lowest. Once I turn it up 1 degree, it starts to blow hot air. I guess it may be the problem of the temperature sensor? But I also noticed the Recirculation mode button seems not working, or something is going wrong with the fresh air intake because I cannot feel the fresh air when I'm driving on the highway. The AC used to be stronger when I'm driving fast.
Anyone has any advice? Does anyone know how to check the interior temperature sensor reading in this model? Thank you very much!!
My GLE C292 coupe has an AC problem these days. It only blows cold air when the temperature is set to be the lowest. Once I turn it up 1 degree, it starts to blow hot air. I guess it may be the problem of the temperature sensor? But I also noticed the Recirculation mode button seems not working, or something is going wrong with the fresh air intake because I cannot feel the fresh air when I'm driving on the highway. The AC used to be stronger when I'm driving fast.
Anyone has any advice? Does anyone know how to check the interior temperature sensor reading in this model? Thank you very much!!
Member
Joined: Jun 2024
Posts: 191
Likes: 58
E320
It sounds like your GLE C292 coupe might be experiencing issues with the blend door actuators or the HVAC control module. When the temperature is set to the lowest setting and the A/C functions correctly, it indicates that the cooling pathway is working, but increasing the temperature likely requires the blend doors to adjust to allow warmer air, which might not be happening properly. A faulty blend door actuator can prevent the doors from moving to the correct positions, causing the system to blow hot air when it shouldn't. Additionally, the malfunctioning recirculation mode button suggests there could be an issue with the HVAC control module or the wiring connecting these components. Another possibility is that the interior temperature sensor is providing inaccurate readings to the ECU, leading to improper temperature regulation. It's also worth checking the fresh air intake system for any blockages or actuator failures that might be affecting the airflow, especially at higher speeds where different airflow dynamics come into play. You should probably run a full system scan. There should be fault codes on at least one or more control modules related to this. You'll either need to take it to a mechanic, but if you want to figure this out yourself, then you'll need to get a full system scanner. The youcanic full system scanner is very good at diagnosing all systems, and there are other scan tools that can do this. Just be careful to use a full system scanner or you may scan the car and see no fault codes as some scanners cant read all vehicle systems. If this helps, I would appreciate a thumbs up. 
Thread Starter
Newbie
Joined: Jan 2024
Posts: 6
Likes: 0
2016 GLE450 AMG Coupe
I tried read the temperature sensors using my Xentry. The cabin air temperature is always -16~17 C. That should be the temperature N22/7b1 sensor inside N22/7. Some threads talked about this problem and it seems to be a 10kOhm resistor. Anyone has any experience on replacing the sensor there? Thanks!!
Last edited by freddieZ; Sep 28, 2024 at 10:25 PM.
