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'99 S80. Blower goes on with engine off and key out.

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
Hendoo
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Joined: Thu Dec 22, 2016 10:27 am
Year and Model: 1999 S80 2.9
Location: SoCal
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Hendoo

'99 S80. Blower goes on with engine off and key out.

Post by Hendoo » Mon Sep 11, 2017 8:32 am

Car is a 1999 S80 2.9 non-turbo. 80k miles. Dealer-maintained and very good shape.

Yesterday, I came home from running some errands and parked the car. An hour or so later, I heard a loud whirring sound... and found the cabin blower was going full blast, even though the engine was off, all the doors and trunk were closed and the key was in my pocket. I had another errand to run, so got in and started the car and drove away.

When I got home, it happened again. This time I tried turning the blower off with the switches, but they had no effect (key was still in my pocket). Then I put the key in the ignition, turned it to "run" and the fan immediately quit. Took the key out and it does not appear to have recurred.

No messages or warning lights on the dash either time. Everything else seems normal.

I'm worried it will run the battery down.... or be the harbinger of other trouble.

Any thoughts? Ever heard of this kind of behavior?

Thanks!

-Hendoo in SoCal

PS -- it is the interior blower/fan only. Not the radiator fan.
-Hendoo
1999 Volvo S80 2.9
1982 Volvo 245 Diesel

precopster
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precopster

Re: '99 S80. Blower goes on with engine off and key out.

Post by precopster » Mon Sep 11, 2017 3:55 pm

Quite normal for a P2 series. The fan comes on to get rid of moisture in the evaporator which is in the dashboard. All of our owned P2s have done this.
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June
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Joined: Wed May 04, 2016 11:18 am
Year and Model: 2004 S80 T6
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June

Re: '99 S80. Blower goes on with engine off and key out.

Post by June » Mon Sep 11, 2017 6:22 pm

Yes I have heard it referred to as afterblow. My 2002 S80 T6 did it shortly after shutting the car off. My 2004 S80 T6 waits a while like 45 minutes. The computer monitors the battery and will not allow it to run down. If the battery is weak afterblow will not come on. June
My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
1998 V70 GT dealer stock car
2002 S80 T6 ordered totalled
2004 S80 T6 dealer stock car and current car owned

Hendoo
Posts: 18
Joined: Thu Dec 22, 2016 10:27 am
Year and Model: 1999 S80 2.9
Location: SoCal
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Hendoo

Re: '99 S80. Blower goes on with engine off and key out.

Post by Hendoo » Mon Sep 11, 2017 6:37 pm

precopster wrote:
Mon Sep 11, 2017 3:55 pm
Quite normal for a P2 series. The fan comes on to get rid of moisture in the evaporator which is in the dashboard. All of our owned P2s have done this.
Well I'll be dipped... it is a feature, not a bug.

It has been very humid here the last few days, so maybe that is why I have never heard it do that before.

Thanks to all. You saved me the cost and inconvenience of a service visit.

-Happy Hendoo.
-Hendoo
1999 Volvo S80 2.9
1982 Volvo 245 Diesel

Hendoo
Posts: 18
Joined: Thu Dec 22, 2016 10:27 am
Year and Model: 1999 S80 2.9
Location: SoCal
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Hendoo

Re: '99 S80. Blower goes on with engine off and key out.

Post by Hendoo » Mon Sep 11, 2017 6:39 pm

Dupelicate post deleted.
-Hendoo
1999 Volvo S80 2.9
1982 Volvo 245 Diesel

rb61
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Joined: Sat Aug 26, 2017 3:16 pm
Year and Model: 2001 s80
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rb61

Re: '99 S80. Blower goes on with engine off and key out.

Post by rb61 » Thu Sep 14, 2017 7:49 pm

This site is great. I just had this happen and was sure I was losing my mind or worse yet, that my newly purchased 2001 S80 had an expensive issue.
Thanks everyone.
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