Engine fan stop time

[graemebillo]

Hi all.

Just wondering thoughts on something.

Cupra 300 67plate

have noticed more recently that the engine cooling fan seems to be on more regularly after stopping whether it be long or short journeys.

Comes on as expected once the engine is turned off and goes off after a minute or two.

But it just seems to be more noticeable recently.

Does anyone have any thoughts on if it's normal or not?

Have checked coolant and all seems OK and it's had major service a few months ago.

Thanks in advance.

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[Cubbington]

Mine does the same, and I was a little paranoid about it at first, but I think it’s normal.

Hopefully someone more knowledgeable than me will provide a definitive answer though

Cheers,

Nick

 

[andy2max]

Mine does the same too, sometimes seems to do it, then other times not. I think it’s pretty normal I’m guessing it’s too cool components and get the heat out rather than letting it sit there in the engine bay after shutoff

 

[LeylandVCDS]

Is it a diesel? If so, it's probably the DPF trying to finish a regen. If the engine is stopped mid-regen, the fans will continue for a few minutes as things get very, very hot during the regen process. Not sure if the petrol GDF does the same, or even whether a 67 plate petrol car would even have one fitted, but if a diesel, it will certainly have a DPF there that will regen itself at least every 150-200 miles

 

[Cubbington]

Good thought, but both mine and the OP’s are Cupra 300!

 

[SRGTD]

Initially I did wonder if it was the GPF (gasoline particulate filter) going through an active regeneration but I think GPF’s were fitted from around Q3 2018 to coincide with the introduction of the revised testing procedures for emissions and fuel consumption - WLTP. With @graemebillo ’s car being a 67 plate, it was built prior to WLTP implementation.

i can vaguely remember the fan(s) on my first VW (a diesel mk4 Golf) continuing to run after everything had been turned off. That was back in 2002 which pre-dated VW fitting DPF’s; I may be wrong and I’m trying to remember back over 20 years ago but I think the cause was a faulty temperature sensor of some sort; sorted under warranty.

 

[Cubbington]

Initially I did wonder if it was the GPF (gasoline particulate filter) going through an active regeneration but I think GPF’s were fitted from around Q3 2018 to coincide with the introduction of the revised testing procedures for emissions and fuel consumption - WLTP. With @graemebillo ’s car being a 67 plate, it was built prior to WLTP implementation.

i can vaguely remember the fan(s) on my first VW (a diesel mk4 Golf) continuing to run after everything had been turned off. That was back in 2002 which pre-dated VW fitting DPF’s; I may be wrong and I’m trying to remember back over 20 years ago but I think the cause was a faulty temperature sensor of some sort; sorted under warranty.

Oh now that’s interesting - mine’s a 2020 GPF car, so it could be that, and ties in with @LeylandVCDS thought about DPF regen - sorry I missed that part of your comment this morning - I was a bit foggy!

Thanks guys!

Nick

 

[SRGTD]

@Cubbington - I’ve not got my VW now but when I did have it, the GPF used to go through an active / forced regeneration around every 4k miles, although the frequency of regens will depend on how a car is used. A car being used for high proportion of shorter journeys, when the engine and exhaust system doesn’t get up to optimum operating temperature, will mean more active / forced regens than with a car being used for mainly long(er) journeys when the exhaust temperature will be high enough to passively neutralise accumulated particulate matter in the GPF.

Have a read of the discussion topic at the link below which includes details of the tell tale symptoms when my VW was going through and active / forced GPF regeneration. It also mentions the ‘official’ procedure in the Seat Leon’s owner’s manual that can be used to help speed up the active / forced regeneration process.

Fuel consumption suddenly increases

In recent days, for some unknown reason, fuel consumption has suddenly increased. Long-term data shows that it has gone from 40 gallons per minute (GPM) to 36 GPM, and it continues to decrease. The tire pressure is also normal, and even with colder weather, such a significant difference should...

www.seatcupra.net

 

[Cubbington]

'Morning @SRGTD ,

Thanks for that info, and reading both your post and thread, I reckon mine's just done an active regen...

The last time it did it was just over a week ago after a 50 mile mixed drive through crappy city traffic, a bit of motorway and the final 25 'A' road miles in a 'spirited' fashion with the gearbox set to sport - when I got home, the fan was still running after I'd unloaded and left the car and there was a 'hot' smell.

The 4k mile regen frequency would make sense, as I've done 12.5k miles since buying it March, it mainly did short journeys until April/May when I started a new job and gave my company car back, so I guess I've only been aware of it because I've clocked up the miles so quickly!

I'll keep an eye on it now, and look for another regen at around 44k miles, which is another point, it's just about to hit 40k miles, so again would make sense that it's just done it!

@graemebillo is this tallying in at all with your experience?

Cheers,

Nick

 

[SRGTD]

'Morning @SRGTD ,

Thanks for that info, and reading both your post and thread, I reckon mine's just done an active regen...

The last time it did it was just over a week ago after a 50 mile mixed drive through crappy city traffic, a bit of motorway and the final 25 'A' road miles in a 'spirited' fashion with the gearbox set to sport - when I got home, the fan was still running after I'd unloaded and left the car and there was a 'hot' smell.

The 4k mile regen frequency would make sense, as I've done 12.5k miles since buying it March, it mainly did short journeys until April/May when I started a new job and gave my company car back, so I guess I've only been aware of it because I've clocked up the miles so quickly!

I'll keep an eye on it now, and look for another regen at around 44k miles, which is another point, it's just about to hit 40k miles, so again would make sense that it's just done it!

@graemebillo is this tallying in at all with your experience?

Cheers,

Nick

Be aware that if you reach your destination and switch off the engine while a regeneration is in progress, the car will recommence the regen where it left off during the next (and subsequent) ignition cycle(s) until it’s completed it. For anyone doing lots of short journeys when the engine and exhaust don’t get up to a sufficiently high enough operating temperature to neutralise accumulated particulate matter in the GPF, interrupting a regen could mean it takes a number of additional journeys to compete the process, during which time fuel consumption will noticeably suffer.

When I had my VW, if I was aware that a regen was in progress as I was reaching the end of my journey, I’d always try and extend the journey to give it time to finish before switching off the engine. I also found that following the guidelines outlined in the manual helped speed up the process.

 

[Mo_86]

The last time mine did a regen i noticed drop in mpg, was fairly sluggish and definitely heard the turbo a lot more, it actually sounded quite nice but me being me I thought it was a boost leak.
After the regen had finished the car was back to it's quiet self.

 

[graemebillo]

Hi all.
Sorry for the late reply been a bit laid up after an op.

Its an interesting thought on the DPF.

Mine it petrol however so didn't think it had one and was the last year I think just before they lowered the bhp to meet the emissions standards. (no digital dashboard either as the trade off. Haha)

The fan will continue after long and short journeys for about 3mins.

As one of the other posters mentioned you can "smell" the heat off it too.

Water is fine, at normal levels, and temps seem ok.
Always paranoid about these as I have had the dreaded water pump housing issue a year or two ago.

Maybe I am just over thinking.

I'll keep an eye out and see if there is any correlation to when it comes on.

Hopefully the talks about the DPFs and regen will have help other users too.

Thanks all, such a good community we all have here.



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[Mo_86]

Hi all.
Sorry for the late reply been a bit laid up after an op.

Its an interesting thought on the DPF.

Mine it petrol however so didn't think it had one and was the last year I think just before they lowered the bhp to meet the emissions standards. (no digital dashboard either as the trade off. Haha)

The fan will continue after long and short journeys for about 3mins.

As one of the other posters mentioned you can "smell" the heat off it too.

Water is fine, at normal levels, and temps seem ok.
Always paranoid about these as I have had the dreaded water pump housing issue a year or two ago.

Maybe I am just over thinking.

I'll keep an eye out and see if there is any correlation to when it comes on.

Hopefully the talks about the DPFs and regen will have help other users too.

Thanks all, such a good community we all have here.



Sent from my XQ-AS72 using Tapatalk

Mine is petrol too but has the opf/gpf.
Yours being 67 that is late 17 early 18?
So no gpf on yours in that case.

 

[andy2max]

Mine is 18 plate with no GPF. Also had water pump and thermostat done last year, car behaved the same with the fans staying on for a few minutes ever since I’ve owned it. Definitely seems to be normal behaviour so don’t worry

 

[Cubbington]

Be aware that if you reach your destination and switch off the engine while a regeneration is in progress, the car will recommence the regen where it left off during the next (and subsequent) ignition cycle(s) until it’s completed it. For anyone doing lots of short journeys when the engine and exhaust don’t get up to a sufficiently high enough operating temperature to neutralise accumulated particulate matter in the GPF, interrupting a regen could mean it takes a number of additional journeys to compete the process, during which time fuel consumption will noticeably suffer.

When I had my VW, if I was aware that a regen was in progress as I was reaching the end of my journey, I’d always try and extend the journey to give it time to finish before switching off the engine. I also found that following the guidelines outlined in the manual helped speed up the process.

Thanks for the additional comments - thankfully my next journey was the 260 mile blast up to work, so would assume that it finished the regen!

Cheers,

Nick

 

[LC_Tom]

Hi all I’m having the same issue posted a thread similar to this about it too. My revs will sit at 1000 and the fans will stay on for a few minutes after shut off. Mechanic has looked at it and showing no fault codes and the soot levels in DPF seem fine and also checked the DPF Sensor all seemed fine, ran a Regen through it and a chemical clean, was fine until I started driving about 4 miles later I stopped at a light and noticed my revs didn’t drop below a 1000 and when I turned it off…. Fan noise again!!! At the weekend I drove about 150 miles in it in the hope it’ll sort it out but nope. I’m starting to think is it normal for the fans to come on and stay on for a few mins when turned off? Or a faulty fan switch or temperature sensor or anything? With the car showing no fault codes it’s hard to pinpoint what it is

 

[Greycupra290]

My car started doing more noticeable fan noises too, it’s a 68 plate cupra 290 so i would start up the car after 12 hour shift and i would br speaking to someone while car is still in idle and after the rpm drop to 500 the fan stays on like loud as if i was driving the car hard, it never used to do that before it just hit 60k i had it since 49k miles

 

[LC_Tom]

My car started doing more noticeable fan noises too, it’s a 68 plate cupra 290 so i would start up the car after 12 hour shift and i would br speaking to someone while car is still in idle and after the rpm drop to 500 the fan stays on like loud as if i was driving the car hard, it never used to do that before it just hit 60k i had it since 49k miles

So the fan noise is sorted but occasionally does still idle high sometimes. The DPF light came on so had the whole DPF off and cleaned and also a new pressure sensor. Seems okay so far, it was stuck in a constant Regen mode I feel and wasn’t actually regenning. But now have a whole other problem which I made a thread about that’s been going on since the DPF issue was told it’s down to the DPF but clearly isn’t.

Bit of a stupid question mate but is your AC on whilst it’s idling because that can cause a fan to come on?

 

[Greycupra290]

So the fan noise is sorted but occasionally does still idle high sometimes. The DPF light came on so had the whole DPF off and cleaned and also a new pressure sensor. Seems okay so far, it was stuck in a constant Regen mode I feel and wasn’t actually regenning. But now have a whole other problem which I made a thread about that’s been going on since the DPF issue was told it’s down to the DPF but clearly isn’t.

Bit of a stupid question mate but is your AC on whilst it’s idling because that can cause a fan to come on?

My one is petrol that’s why i don’t think the dpf is in my car, but to answer your question no i do not have the AC on I haven’t had it on for a while that’s why it’s s bit confusing to me why it has loud fan noises when i start the car and most of the time whenever i turn the car off after even a short journey

 

[LC_Tom]

My one is petrol that’s why i don’t think the dpf is in my car, but to answer your question no i do not have the AC on I haven’t had it on for a while that’s why it’s s bit confusing to me why it has loud fan noises when i start the car and most of the time whenever i turn the car off after even a short journey

Strange one that bud have a look through the forum and see if anybody else has the same issue? Could maybe be a temperature sensor or something that’s faulty and giving wrong readings and the fans are coming on and staying on as a precaution even if the car is not hot