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Vent fan continues to run

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
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Aznav
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Vent fan continues to run

Post by Aznav » Thu Jul 11, 2019 1:55 pm

Lately I have noticed that the vent fan in my XC 90 will continue to run when I get out of the car. If I don't have my hearing aids in I will sometimes miss it running. It is not every time. In fact, maybe once a week or every other week. It does not shut off with obvious results. Any hints?



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Re: Vent fan continues to run

Post by bmdubya1198 » Thu Jul 11, 2019 6:19 pm

Somebody on Facebook just asked about the same thing yesterday, it's completely normal. It's an "after-blow" feature in P2 Volvos to defrost the AC system and prevent mildew buildup. It may run for about 30 minutes after shutting off the car.


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Re: Vent fan continues to run

Post by Aznav » Fri Jul 12, 2019 4:38 pm

WHOA!! THANK YOU! WHO KNEW??



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Re: Vent fan continues to run

Post by bmdubya1198 » Fri Jul 12, 2019 7:43 pm

It's interesting, I've never noticed this before in either of my P2s.


2000 V70R Venetian Red/Charcoal M56 Swapped 191k
2000 S70 GLT Mystic Silver/Taupe 2??k
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Re: Vent fan continues to run

Post by ggleavitt » Fri Jul 12, 2019 9:15 pm

Aznar wrote:
Thu Jul 11, 2019 1:55 pm

Lately I have noticed that the vent fan in my XC90 will continue to run when I get out of the car.

It does not shut off with obvious results.
I like the answer in the earlier post and it's my understanding that the afterblow software function was turned on by default with many of the early XC90s so it’s a possible scenario.

I had the function activated on both my vehicles (was deactivated when I took ownership), the '05 as part of the dealer's 7.5k "checkup" and with the '08 I paid to have the function activated. It was stupid expensive IIRC but I really like the feature and it's made a difference over the years to me, especially where I live.

See viewtopic.php?f=9&t=49926 , jimmy57 quotes the TN which shows the criteria a little lower down and adds a few details that may also be helpful in determining exactly what's going on. It's for another model but the function is more or less the same.

I believe some vehicles have it on by default and some do not. See- https://forums.swedespeed.com/showthr...le-on-XC90-V8s for one example specific to V8s where it’s maybe never turned on by default.

Which brings me to the first sentence in the OP's quote above. If the interior fan is running when you get out of the car, then that's not afterblow. And if you hear it only when you put in your hearing aids, I'm wondering if it might be the little interior cooling fan behind the 3-slot grate mid-right on your climate panel as jimmy57 describes in the post, something to consider. The climate fan on afterblow is pretty loud when you hear it, but you should only hear it a little less than an hour after stopping the vehicle. I heard mine in the garage the other day, ran pretty much half speed for the 15 minutes the TN calls out (full speed 7 minutes for '03-04 I think), and a little more than an hour after I shut it down. That's afterblow, at least as I’ve ever known it.

And if I interpret the second sentence as meaning the battery goes dead, then it seems like you might have another issue or more than one issue at play. Is this correct, the battery goes dead?

Battery original by any chance? Any other functional module on the car not working consistently?

One thing to consider if you’re not the original owner- If the battery has been changed, capacity for a T6 should ideally be the Group 49 battery versus the smaller Group 48 that's in many of the 5 cylinders, although it can vary depending on what accessories came with the model I think..

Regardless of engine type, both vehicles can take the larger 49 battery by moving the bracket at the bottom right or the battery tray (I replaced the original Volvo ’08 Group49 lead acid with a Bosch AGM, and moved it into the ’05 couple years ago. That car loves it).
If you do find yourself needing a new battery and the charging system is sound, get the large capacity one.

If you could clarify the above, might help to get closer to the cause. Something tells me this may not be afterblow.

Good luck.
edit 071219- fix typo


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Re: Vent fan continues to run

Post by bmdubya1198 » Sat Jul 13, 2019 8:53 am

That's true, the after blow shouldn't come on until about 30-45 minutes after shutting the car off. If it continues to run after removing the key, your blower resistor may be bad. This part here: https://www.fcpeuro.com/products/volvo- ... wE#fitment


2000 V70R Venetian Red/Charcoal M56 Swapped 191k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 160k
1993 944 Base Beige/Beige 221k
1992 Miata Mariner Blue/Black 146k
Sold-
1998 V70 GLT Black/Beige 193k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it


Need used parts? PM me!

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Re: Vent fan continues to run

Post by oragex » Sat Jul 13, 2019 10:07 am

Maybe try to see if it spins like thins only when the A/C is used. And also for how long it spins. May get back to the car 1h later see if it's still running.



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