Hello, recently my air conditionor kinda stopped working.

In the morning or in the evening everything works just fine, normal operation.

In the middle of the day, being hot outside (30 to even over 40 degrees outside temperature), when i start the car, for 10-20 seconds everything works, after that a noise like a buzz starts to hear from around the middle of the car. While this sound is generated, the ventilation system still blows but very poor power.

After another 20-30 seconds the sound stops and also the ventilation system stops working, the fan in front of radiator also stops and i can t even control the vent system to turn on heat at least, nothing.

If anyone can help with anything, pleas do.

Thank you in advance, have a nice day!

Sorry to state the obvious, but it may possibly need a re-gas?

You could try this

On 01/07/2026 at 14:39, Lordegor said:

Hello, recently my air conditionor kinda stopped working.

In the morning or in the evening everything works just fine, normal operation.

In the middle of the day, being hot outside (30 to even over 40 degrees outside temperature), when i start the car, for 10-20 seconds everything works, after that a noise like a buzz starts to hear from around the middle of the car. While this sound is generated, the ventilation system still blows but very poor power.

After another 20-30 seconds the sound stops and also the ventilation system stops working, the fan in front of radiator also stops and i can t even control the vent system to turn on heat at least, nothing.

If anyone can help with anything, pleas do.

Thank you in advance, have a nice day!

before the post i did the following
-tested the fuses, none blown all have continuity, all have clean pins
-did the flaps adaptation, just like in the video sent by @ords
-ac installation was filled like 3-4 months ago

After the post (2 days ago):
-tested the car with VCDS (in the middle of the day, when ventilation wasn t working):

393476 - Air Blower B10BE 13 [009] - Open Circuit [New feature! Extended UDS fault detail is only supported by current gen. interfaces] Confirmed - Tested Since Memory Clear Freeze Frame: Fault Status: 00000001 Fault Priority: 2 Fault Frequency: 4 Reset counter: 146 Mileage: 262266 km Date: 2026.07.02 Time: 17:35:27 Voltage terminal 30: 13.5 V Outside temperature: 36.0 °C Inside temperature: 38.6 °C Blower voltage: specified value: 10.1 V Blower voltage: actual value: 25.4 V

393473 - Air Blower B10BE 96 [009] - Component Internal Failure [New feature! Extended UDS fault detail is only supported by current gen. interfaces] Confirmed - Tested Since Memory Clear Freeze Frame: Fault Status: 00000001 Fault Priority: 2 Fault Frequency: 1 Reset counter: 147 Mileage: 262266 km Date: 2026.07.02 Time: 17:35:27 Voltage terminal 30: 13.5 V Outside temperature: 36.0 °C Inside temperature: 38.6 °C Blower voltage: specified value: 10.1 V Blower voltage: actual value: 25.4 V

After this i took out the blower out of the car, and put it on a car battery at 12V, it spinned, and fast.
I measured with a multimeter from car to blower: 12V on the plug

i measured then the resistor/command module (5Q0 907 521 E) that is mounted on the blower. I measured the resistance of the 4 pin plug that is on the command resistor, and from the compinations of measuring from 1-2, 1-3, 1-4, 2-3, 2-4, 3-4, i ve got resistances of 30-50x megaohms, one in the order of 10x kiloohms and OL.

now i think that this command resistor has some internal damage and i will try to replace it, hope it will work. Again if anyone has any ideea of that, or if what i did seems ok or not, please leave an answear.

Again thanks in advance, have a nice day!