Air box fan staying on

[IANF67]

Hi folks
went out to find my b6 cab as dead as a dead thing this morning, began by attaching jump leads which got it goin but noticed the motor inside the air filter box starting and stopping constantly. I didn't even know it had a fan in there lol. Is there anything I can do. Can I disconnect it? Do I need it working?
Any help is most welcome
cheers

 

[Greeny233]

Don't think there is a motor in the air filter box. It is literally a box for the air filter.

 

[IANF67]

I could be missing something then but it definitely sounds like a mini hairdryer coming from inside the box

 

[AudiLeon]

Is it petrol? Might have an auxiliary air injection system.

 

[IANF67]

Yeah mate it's the 3.0l V6

 

[AudiLeon]

My old Vectra used to have a air injection system that pumped air into the exhaust manifold.

 

[IANF67]

Deffo have a fan spinning in the air filter housing. Booked in on Friday morning. Anyone know what it does?? Does it have a relay or a sensor that might be at fault ?

Cheers

 

[IANF67]

Turns out it's the secondary air injection fan. Needed a new relay. It's under the ecu which is under the plastic shroud at bottom of windscreen on the drivers side. Just incase anyone else has the same problem

Cheers

 

[AudiLeon]

Damn I'm good.

 

[jbcalvin]

Is it just petrols that have this or diesels as well...... My car is making the same hair dryer sound intermittently when turned off..... 1.9 tdi

 

[AudiLeon]

Pretty sure the diesels don't have it.