2006 Audi A3 Q&A
Is there coolant in the expansion tank? Is the fan working? Can you get heated air out of the vents? - Hal...
Could also be the cooling system thermostat, restricted radiator, or a mildly blown head gasket. Get this checked out as more serious damage may occur. - patrick mannion
If your A3 is only overheating in traffic it's due to the radiator fans not coming on asthe thermo switch at the radiator id defective. We've seen a few of these. Feel free to give me a call at 415-241-8178 and we will look at it for you at N/C. Take care, Mike - Royal Motor Sales