Cooling fans run when engine switches off

[gibbo62]

Hi Guys

Any thoughts on my A4 bB. No engine light on dash, but my cooling fans come on when I shut the car down. They come on about 20 secs after get out of the car and run for about 4/5 minutes. Engine temp is ok.

 

[rich dj]

More than likely it’s done a DPF regen and cooling down afterwards as it gets up to 650 plus degrees.
My 2 litre B8.5 2015 does this and have also checked via the app VAG-DPF only available on android at the moment.


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[jdp1962]

@gibbo62, which engine does your car have?

 

[gibbo62]

@gibbo62, which engine does your car have?

The thing is it is doing it all of the time for about three weeks now on short and long runs. its a 2.0 tai B8 CJCA 100247

 

[rich dj]

2.0 Tdi 190bhp.
How many miles has it done?
Can you borrow someone’s android phone who has the app and the OBD connector or if someone has Vag-com to check to see if it’s completing the Regen.
I assume the temperature is still stuck on the 90 degrees?



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[gibbo62]

its done 100K. Every run out I have done whether its short or a long run the fans always run when the engine switches off. The engine temperature is at 90 degrees. I do have VCDS if that is any good.

 

[rich dj]

I haven’t had time or need to check in VCDs as yet.
I would look at distance or time since last regen and soot level.




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[Marky007]

Could be fan sensor I have same engine and my fans come on when dpf has or is doing a regen but all the time no.
1. Fan sensor
2.dpf clogged
3. Thermostat knackered wont let car get upto temp to regen

Thats My 50p worth

 

[Sherv]

My old B8 A3 170bhp did this, changed two sensors to no avail, never found the cause and it still does it after two years.

 

[Booboo]

I had this once on my astra. It was the resistor pack for the fan. Looks like a multi pointed block.

 

[Neil Wilkinson]

I could be wrong but doesn’t the fan run after switch off if you’ve had the AC on?