Hi, I have a Skoda Octavia and for some reason the last couple of nights I’ve noticed my car has been running the fans so hard that it sounds like an aeroplane taking off. This is hours after I’ve got home from work so it can’t be anything to do with the cooling system. Any ideas would be greatly appreciated. Thanks. 

 

If it's a diesel, then this thread is for you.

 

6 hours ago, ords said:

 

If it's a diesel, then this thread is for you.

 

Thanks for this but I know about the regen cycle. My car does it more than most and I’m used to it but this is something different. As I said it’s hours after I’ve driven the car so it’s not in the middle of a regen,m. It’s when it’s been sat for a few hours after I’ve got home and is locked and sat on the driveway so the car is cold. The fans just come on randomly on full power. Then when I unlock it the fans stop straight away, it’s really weird.  

Humm...not good.  Firstly get a code scan done, but I think you might have a problem with the ECU.  I've seen this before where you get intermittent connectivity on the CANBUS network (caused either by a connection/module issue or a failure motherboard on the ECU) and the car freaks out and shows that by putting the fans full on.  Code Scan - post it here....and we can comment further.