VW TIGUAN 2018 Weird whirr sound after shutting engine off?

[steep crown]

So when i turn my car off (the engine)

I start hearing this sound for about a minute.

[wild forum]

Waterpump or something. Its normal

[hybrid minnow]

What motor is it?

[steep crown]

i see

[steep crown]

i4 2.0 tdi

[hybrid minnow]

Your radiator fans are on because the car tried to do a regeneration of the DPF

I would advise against turning it off and instead going on a 30min highway drive

To allow the DPF to regenerate

It needs heat which you get from higher loads

[steep crown]

but the radiator fan is infront of the car

the noise is more audible from the back of the engine bay (closer to the steering wheel)

[steep crown]

i took it for an hour drive today, ill drive again and test if the sound is still there

[hybrid minnow]

If it's not the radiator fan spinning then it isn't the dpf, don't bother

Are you able to see what is making the sound or locate exactly where it is

[wild forum]

@hybrid minnow @steep crown Why are we trying to diagnose a non issue? ModernCars made in the last 20+ years have post shutdown routines and its normal that they make some noises. As long it is consistent and does not sound broken in an obvious way its fine. My 2016 TDI does smilar noises. My 20 year old shitbox zeros the idle valve 30 seconds after shutdown causing a "Vrrrr, click, click" noise.

[steep crown]

Im worried becusse I just paid a lot of money for a major service and some fixes

[scenic canyon]

GG @steep crown, you just advanced to level 10! Chat more to level up and earn top roles!

[steep crown]

I replaced the ebrake motor

[steep crown]

You’re right I shouldn’t be too worried tho lol this isn’t the worst sound

[wild forum]

I am pretty sure the DPF needs the engine running to regenerate. Anyway. As i said it is probably running the coolant pump. My best guess is to avoid heatsoak where the coolant inside shutoff engine gets above 100c.

If the turbo is liquid cooled it could also be to cool that thing down.

[hybrid minnow]

Cars make certain noises when turned off, yes that's correct, this noise for this long is not something I've ever heard and sounds distorted which led me to believe it was the radiator fan

Another reason I am sharing my thoughts is because he posted it asking for help as he does not recognise the noise

[hybrid minnow]

When a DPF is undergoing regeneration and you shut the car off, the radiator fan is heard very loudly to keep the engine from overheating due to extremely high temperatures from the regeneration

If you have mechanical knowledge you would know that this is not the water pump as the water pump is cambelt driven and stops spinning when you shut the car off

[wild forum]

If you have mechanical knowledge of tdi engines you know there is an auxiliary electric pump.

[hybrid minnow]

You also used heatsoak to describe overheating, when it actually means that an engine is noticably losing power due to high IATs

[hybrid minnow]

Hey check this out

Belt driven

Describe how a belt keeps spinning when the engine is off

[wild forum]

There is another pump.

[hybrid minnow]

I'll show you a water pump I replaced on a Passat next time I'm at the shop too

[hybrid minnow]

Lmao

[wild forum]

How would the DPF regen thing you described work if there is no auxiliary pump. No point in running the rad fans if the coolant is not circulating.

[hybrid minnow]

The electronic pump does not make noticable noise

It is very easily drowned out even by electronic clicking

[wild forum]

Have you watched the video he original posted?

Also https://youtu.be/6TOWrAQMjVE?si=elz2Vl8JLik1RBlq

[hybrid minnow]

I did, that whining is definitely not how an electronic aux pump sounds

[wild forum]

Definitely does not sound like radiator fans tho.

[hybrid minnow]

I said earlier that it probably isn't especially after he mentioned where the sound is coming from

[wild forum]

That was the giveaway? Not the noise in the video itself?

[hybrid minnow]

The sound is very distorted as I said earlier

[wild forum]

No

[hybrid minnow]

I'll show you a video of what radiator fans sound like if that's what you'd like

I just work with this, I clearly have no idea what I'm talking about apparently

You're even more crazy for suggesting that an aux electronic water pump sounds like that if anything

[wild forum]

Yes. You show a lack of basic knowledge of the cooling system on a vw.

[hybrid minnow]

Definitely

[wild forum]

@steep crown Is your car equipped with the optional Webasto/Diesel cabin heater?

[hybrid minnow]

"Why are we trying to diagnose a non issue?"

[steep crown]

No it’s a gcc spec

Imma take it back to the workshop tomorrow

Hopefully he doesn’t scam me 💀

Imma drive it again in a bit , I’ll test and see if the sound is still there

[hybrid minnow]

Was the sound there when you first purchased the car or has it appeared recently

[steep crown]

Im fairly certain thst it’s a new sound, unless I never noticed it before

[hybrid minnow]

Where is the sound coming from

[wild forum]

Didn't you already ask that?

[hybrid minnow]

I did

I never got a clear answer

"Behind the steering wheel" doesn't tell a lot

[steep crown]

It gets louder under the steering wheel

Yeah it’s not a specific point but it’s most audible there

[hybrid minnow]

From the interior or when you open the hood and stick your head down

[steep crown]

From the interior and the hood

From both sides

Im walking rh so sorry for the dry replies

[hybrid minnow]

It's always best if you visit a shop and see what they say, have them take a better look

They might even tell you the sound is normal, not sure how loud that really is in real life