About -5 to 5 deg, this started recently, it save me some time if someone know what is wrong.
I think I will start with changing the temp sensor.
Both electrical fans are on full speed and it start immidietly when I switch the car on.
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fan control module, thermistor, or fan switch. VAG to know for sure.
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actually, it's the blue aux fan switch under the front of the engine. the green sensor in the back is the coolant temp sensor for the ECM and cluster. both fail regularly and both use the same o ring and clip. with any fan issues, I have been told to replace both first and then look elsewhere. if not the aux fan switch, check the fan control module. a faulty module will throw a code I am told. I have read many posts where a new blue aux fan switch was the cure.