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Martin_B9
in Audi A4 (B9) Forum

Featured Replies

Hi, I’m having an issue with the cooling fan on my B9.

The engine is overheating, with temperatures going above 90°C. The AC is on, but the fan still doesn’t activate.

I tried activating the cooling fan using OBD, but I get a fault: no response from the fan.

I’ve checked the fuses and relay, and both are fine. The thermostat is also working properly.

I also tested a spare cooling fan, but it didn’t work either, so it doesn’t seem like the fan itself is the problem.

I checked the fan connector with a multimeter. The small red wire shows no voltage, while the other three wires do. The main wire reads slightly below 12V (around 11.57V).

Has anyone experienced a similar issue or have any ideas what might be causing this?

My guess is that one of the wires may be damaged or broken somewhere.

Vehicle: Audi A4 2016 (110 kW / 150 PS)

6 hours ago, Martin_B9 said:

Hi, I’m having an issue with the cooling fan on my B9.

The engine is overheating, with temperatures going above 90°C. The AC is on, but the fan still doesn’t activate.

I tried activating the cooling fan using OBD, but I get a fault: no response from the fan.

I’ve checked the fuses and relay, and both are fine. The thermostat is also working properly.

I also tested a spare cooling fan, but it didn’t work either, so it doesn’t seem like the fan itself is the problem.

I checked the fan connector with a multimeter. The small red wire shows no voltage, while the other three wires do. The main wire reads slightly below 12V (around 11.57V).

Has anyone experienced a similar issue or have any ideas what might be causing this?

My guess is that one of the wires may be damaged or broken somewhere.

Vehicle: Audi A4 2016 (110 kW / 150 PS)

Hi if the aircon fan works but the main fan won't its as cliff said the control module which normally involves replacing the fan pack as a lot of fan packs you can't just replace the module.

Steve.

  • Author

Hi,

Thank you for your response. I have a single fan, not a dual fan.

  • Author

IMG_0388.jpeg

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