Loud Fan

neon · Feb 24th, 2018, 15:57

I have just noticed on my last 2 journeys that when I park up on the drive there is a very loud fan running under the bonnet when I turn the engine off. It turns off when I lock the car.
I have never had this before in 18 months, even in hot weather. I wonder if this is something to do with the last software update I had done recently.

Whippy · Feb 24th, 2018, 16:24

Quote:

Originally Posted by neon

I have just noticed on my last 2 journeys that when I park up on the drive there is a very loud fan running under the bonnet when I turn the engine off. It turns off when I lock the car.
I have never had this before in 18 months, even in hot weather. I wonder if this is something to do with the last software update I had done recently.

Sounds like a regen.

Clan · Feb 24th, 2018, 16:36

Quote:

Originally Posted by neon

I have just noticed on my last 2 journeys that when I park up on the drive there is a very loud fan running under the bonnet when I turn the engine off. It turns off when I lock the car.
I have never had this before in 18 months, even in hot weather. I wonder if this is something to do with the last software update I had done recently.

It could be your new software , the fan is programmed to do that under several circumstances , including a hot engine bay , maybe you were in a queue for a long time ...so do not worry about it .

neon · Feb 24th, 2018, 19:09

Quote:

Originally Posted by Clan

It could be your new software , the fan is programmed to do that under several circumstances , including a hot engine bay , maybe you were in a queue for a long time ...so do not worry about it .

Today I had travelled about 80 miles on motorway at only 60mph using ACC, as I had picked someone up coming out of hospital, no queues or anything and outside temp was about 6C. Very strange as it must have been running at full speed as it was pretty loud.

simonjedrake · Feb 24th, 2018, 19:45

Quote:

Originally Posted by neon

Today I had travelled about 80 miles on motorway at only 60mph using ACC, as I had picked someone up coming out of hospital, no queues or anything and outside temp was about 6C. Very strange as it must have been running at full speed as it was pretty loud.

Pretty normal, nothing to worry about as long as it turns off relatively soon after you turn off the ignition.

Considered1 · Feb 24th, 2018, 20:31

Def a regen

BarryUK · Feb 25th, 2018, 09:27

As a couple of others have said, it sounds like a Diesel Particulate Filter, (DPF), regeneration. I googled it the first time I saw it mentioned on here and found the following which explains it:

"The DPF needs to be cleaned regularly, through a process called regeneration, either active, passive or forced regeneration, the accumulated soot is burnt off at high temperature (around 600°c) to leave only a residue of ash, effectively renewing or regenerating the filter, ready to take on more pollution from the engine."

Trifid · Feb 25th, 2018, 09:44

How frequently do people find that their car does a regen?

nu11eaf · Feb 25th, 2018, 10:21

Quote:

Originally Posted by Trifid

How frequently do people find that their car does a regen?

You may not know it is happening, I have only noticed it once in the 20 months I have had my XC90 and in my last 3 MK 1 XC90's I was not aware of it ever happening.

neon · Feb 25th, 2018, 11:01

I have had this twice this week, Fri and Sat, both on my drive just as I have stopped after a very similar journey of about 80 miles.

Feb 24th, 2018, 15:57	#1
neon Premier Member Last Online: Apr 2nd, 2023 10:37 Join Date: May 2016 Location: Yorkshire	Loud Fan I have just noticed on my last 2 journeys that when I park up on the drive there is a very loud fan running under the bonnet when I turn the engine off. It turns off when I lock the car. I have never had this before in 18 months, even in hot weather. I wonder if this is something to do with the last software update I had done recently. __________________ MY17 XC90 D5 Powerpulse Inscription, Polestar, Osmium Grey, Blond, Walnut, Xenium, Winter with HUD, Auxiliary Heater, Homelink, Heated Rear Seats, Subwoofer, Apple Car Play, Tinted Windows

Feb 24th, 2018, 20:31	#6
Considered1 Premier Member Last Online: Jul 13th, 2021 21:30 Join Date: Jan 2014 Location: North Yorkshire	Def a regen __________________ Audi RS6 5.0 v10 Quattro, Sepang Blue, Dynamic Ride Control BOSE TV 572hp 20" wheels Fuel Card! MY15 Volvo XC60 D4R-Design LuxNav FWD Auto Polestar 200HP, Saville Grey,Privacy,DSP,Winter illumination,On Call,Gear Shift,F&R Park Assist & Camera

Feb 25th, 2018, 11:01	#10
neon Premier Member Last Online: Apr 2nd, 2023 10:37 Join Date: May 2016 Location: Yorkshire	I have had this twice this week, Fri and Sat, both on my drive just as I have stopped after a very similar journey of about 80 miles. __________________ MY17 XC90 D5 Powerpulse Inscription, Polestar, Osmium Grey, Blond, Walnut, Xenium, Winter with HUD, Auxiliary Heater, Homelink, Heated Rear Seats, Subwoofer, Apple Car Play, Tinted Windows

Feb 25th, 2018, 09:27	#7
BarryUK Junior Member Last Online: Oct 8th, 2020 13:48 Join Date: Nov 2017 Location: Marple Bridge	As a couple of others have said, it sounds like a Diesel Particulate Filter, (DPF), regeneration. I googled it the first time I saw it mentioned on here and found the following which explains it: "The DPF needs to be cleaned regularly, through a process called regeneration, either active, passive or forced regeneration, the accumulated soot is burnt off at high temperature (around 600°c) to leave only a residue of ash, effectively renewing or regenerating the filter, ready to take on more pollution from the engine."

Feb 25th, 2018, 09:44	#8
Trifid New Member Last Online: Sep 11th, 2020 17:15 Join Date: Oct 2013 Location: UK	How frequently do people find that their car does a regen?

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