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W205 C200 Wired AC problem

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Old Aug 30, 2023 | 10:38 AM
  #1  
frankonline's Avatar
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C200 W205
W205 C200 Wired AC problem

My car's AC just acts wired on AUTO setting. When the outside temp is 30 degrees Celsius, if i set the climate control to 24 Celsius it work for a while and just on and off while driving. This makes the people inside cabin sweat and need to lower another 2 degrees to start cooling again. After few more minutes, it again starts to cool lower and makes the cabin hot. Finally if I put it 20 or 18 degrees Celsius it works normally.

The compressor works and blows the ice cold air when it works. But after some time it lowers its cooling power inconsistently regardless of reaching the set temperature.

what can be the issue? Can it be an issue with cabin air temp sensor? If so, where its located?

Thanks

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Old Sep 2, 2023 | 06:46 PM
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Originally Posted by frankonline
My car's AC just acts wired on AUTO setting. When the outside temp is 30 degrees Celsius, if i set the climate control to 24 Celsius it work for a while and just on and off while driving. This makes the people inside cabin sweat and need to lower another 2 degrees to start cooling again. After few more minutes, it again starts to cool lower and makes the cabin hot. Finally if I put it 20 or 18 degrees Celsius it works normally.

The compressor works and blows the ice cold air when it works. But after some time it lowers its cooling power inconsistently regardless of reaching the set temperature.

what can be the issue? Can it be an issue with cabin air temp sensor? If so, where its located?

Thanks
The sensor is underneath the glovebox underneath a plastic cover, the same cover hiding the activated charcoal cabin air filter.
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Old Sep 2, 2023 | 08:00 PM
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3-4 people in a car with 30 deg C exterior puts a fair load on the HVAC. 20 deg C is the correct setting in my view. Otherwise the system can't keep up with the combined exterior + interior heat loads.
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Old Sep 2, 2023 | 08:03 PM
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Originally Posted by chassis
3-4 people in a car with 30 deg C exterior puts a fair load on the HVAC. 20 deg C is the correct setting in my view. Otherwise the system can't keep up with the combined exterior + interior heat loads.
This too.
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Old Sep 4, 2023 | 10:53 AM
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c-class C200d w205
Originally Posted by frankonline
My car's AC just acts wired on AUTO setting. When the outside temp is 30 degrees Celsius, if i set the climate control to 24 Celsius it work for a while and just on and off while driving. This makes the people inside cabin sweat and need to lower another 2 degrees to start cooling again. After few more minutes, it again starts to cool lower and makes the cabin hot. Finally if I put it 20 or 18 degrees Celsius it works normally.

The compressor works and blows the ice cold air when it works. But after some time it lowers its cooling power inconsistently regardless of reaching the set temperature.

what can be the issue? Can it be an issue with cabin air temp sensor? If so, where its located?

Thanks
did you find a solution?
i have the same problem
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