Loud Ventilator noise after driving?

**Slarney** · 13-12-2015,06:51 PM

I have a 2015 Audi A6 2.0 TDI S line.

I've only recently just bought it (September 2015), and now I already suspect something. The thing is that when I drive around for some time, even just 10 minutes, after turning off the car, the ventilator seems to work very loudly, even when locking the car, until some time. This is strange because I don't drive very erratically nor do I live in a country/place with an extreme climate. Temperatures where I live average about 10 degrees Celsius. Any help?

I also haven't been to the dealership to ask them, I will do that next week.

**Guest 2** · 13-12-2015,06:52 PM

Can I ask what you mean by "ventilator"?

**Slarney** · 13-12-2015,06:53 PM

I don't think it's the ventilator, I haven't looked, but it I think it's something that tries to cool the engine down, I'm not sure, sorry.

**zollaf** · 13-12-2015,06:54 PM

you mean your electric fan kicks in and runs for a few minutes after you drive your car. ?

**Slarney** · 13-12-2015,06:56 PM

Originally Posted by zollaf

you mean your electric fan kicks in and runs for a few minutes after you drive your car. ?

Probably, the reason I posted this is because this hasn't been happening since I got it until around this week, and all the cars I've had in the past never did this.

**ukgroucho** · 13-12-2015,06:57 PM

Or it's doing a DPF regeneration. Should not do it all the time though although there are reports that face lift cars do it more often and that newer cars seem to want to do it more in the first few months.

**Slarney** · 13-12-2015,06:59 PM

Well, I'll probably drive it around for a few months and see what happens.

**Scott K** · 13-12-2015,07:16 PM

As said, it will be the car cooling down after the DPF regen. Mine does this and is accompanied by the fans running, a lot of heat from the engine and a burning smell like a new oven.

**Slarney** · 13-12-2015,07:17 PM

You explain it just like it is, thanks.

**wildbore** · 13-12-2015,08:01 PM

My petrol engine car does this, too - every time, even after only a few minutes' gentle driving.

There has been a big push in recent years to reduce the heat capacity of the engine block in order to reduce warm-up time and so increase fuel economy. Engine blocks also are generally running with much smaller volumes of coolant for the same reason. I suspect / hypothesize that the fan runs on as a matter of course on modern cars not necessarily because of a DPF regen (though that obviously does happen at times) but more often because car engines can no longer handle the levels of heat dissipation that is necessary after switch off arising from the reduced thermal mass of the block and coolant. Just a theory.