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Clean this sensor if you have not

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.
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June
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Clean this sensor if you have not

Post by June » Tue Jan 23, 2018 7:13 am

I was reading a thread on here where someone mentioned this sensor may need to be cleaned. Sure enough mine was full of fluffy stuff. Now for years my car only seemed to blow ice cold air out if the vents only on the hottest day like 100°, even set all the way to cold. Yesterday the outside temp reached 80° and even as the day cooled in the evening the vent temp stayed ice cold without the constant sound of the electric doors of the climate system changing position like they were hunting. How this sensor could cause such a profound effect, I can't say.

In the pic the red area is fluff I missed, green is the sensor area. June
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matthew1
My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
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Re: Clean this sensor if you have not

Post by matthew1 » Tue Jan 23, 2018 11:35 am

June, this is a good reminder.

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Re: Clean this sensor if you have not

Post by mrbrian200 » Tue Jan 23, 2018 11:51 am

To anyone stumbling across this thread, be aware this sensor is considered fragile. Preferred method to clear it would be alternating between light/low pressure compressed air and suction from a vacuum hose. If you stick anything through those holes be extremely careful to pick away at the fluff that seems to accumulate there while not exerting pressure on the sensor element itself.
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Rattnalle
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Re: Clean this sensor if you have not

Post by Rattnalle » Tue Jan 23, 2018 12:15 pm

The best way would be to take the AC control panel out (it's quite easy) and cleaning it from behind. There's a small fan in the rear moving air across the sensor. There's more room to clean carefully from there.

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June
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Re: Clean this sensor if you have not

Post by June » Tue Jan 23, 2018 1:40 pm

I used the vacuum cleaner 1/2 at a time avoiding the center using the crevice attachment alternating one side than the other until all the visible fluff was gone. More has shown up from behind so my sensor was plugged good. June
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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

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Re: Clean this sensor if you have not

Post by mrbrian200 » Tue Jan 23, 2018 6:31 pm

Wasn't aware about there being a fan there, out of curiosity I looked it up....

Eek Gads that little plastic fan behind there is $180.00. Just push me in front of a train why dontcha.
P/N 8691666

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June
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Re: Clean this sensor if you have not

Post by June » Tue Jan 23, 2018 8:06 pm

mrbrian200 wrote:
Tue Jan 23, 2018 6:31 pm
Wasn't aware about there being a fan there, out of curiosity I looked it up....

Eek Gads that little plastic fan behind there is $180.00. Just push me in front of a train why dontcha.
P/N 8691666
That's Volvo for you, they think of everything! 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

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June
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Re: Clean this sensor if you have not

Post by June » Thu Sep 19, 2019 5:03 pm

June wrote:
Tue Jan 23, 2018 7:13 am
I was reading a thread on here where someone mentioned this sensor may need to be cleaned. Sure enough mine was full of fluffy stuff. Now for years my car only seemed to blow ice cold air out if the vents only on the hottest day like 100°, even set all the way to cold. Yesterday the outside temp reached 80° and even as the day cooled in the evening the vent temp stayed ice cold without the constant sound of the electric doors of the climate system changing position like they were hunting. How this sensor could cause such a profound effect, I can't say.

In the pic the red area is fluff I missed, green is the sensor area. June
Just a reminder to clean this sensor! Lately my A/C has not been cooling down right unless it's 100° outside. Then I thought about this sensor. I could not believe how much lint came out. I used a vacuum cleaner again and huge chunks came from deep inside. Now the A/C is back to normal again. So Jan 2018 to today it cloged again. 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

Cees Klumper
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Re: Clean this sensor if you have not

Post by Cees Klumper » Sat Sep 21, 2019 9:05 am

That's quick, I don't think I ever cleaned the one in our 2002 one and the A/C has been operating fine the 5 times or so a year we turn it on. Perhaps that fan only comes on when the A/C is turned on, so that would explain difference in cleaning frequency need. I'll have a look at it.

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Re: Clean this sensor if you have not

Post by ndphotonl » Wed Sep 25, 2019 9:48 am

Good tip, to clean this sensor. Please note that runs for a little while, even if you have shut of the ignition.

Also, if you disconnect that part of the dashboard and put it on ignition, you will receive an error on the dash. It seems a crash sensor of some sorts is builtin into that part.
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