Cabin blower speed problem

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Post Reply
radek93
Posts: 44
Joined: Sat Dec 07, 2019 2:43 pm
Year and Model: S70 98
Location: Home

Cabin blower speed problem

Post by radek93 »

Has anyone had a problem with the cabin blower. After turning on the airflow to max and the external circulation, after a minute, the speed drop and hummed as if something was putting resistance to the air. After turning on the circulation inside, it blows to the maximum and the speed do not drop. Changed air conditioning panel for another used one and still the same. Automatic air conditioning panel.

scot850
Posts: 6561
Joined: Mon Apr 05, 2010 2:46 pm
Year and Model: 2000 V70 R
Location: Calgary, Alberta, Canada
Has thanked: 22 times
Been thanked: 309 times

Post by scot850 »

It could be the cold air flap is stuck or broken in a closed position. There is a small plastic leaver that breaks with age. Don't believe it is expensive (relatively!).

To access it you need to remove the passenger side dash under tray and remove the glove box liner to give better access to see what is going on. The lever is on the side of the blower motor housing on the left. There is a small servo motor on the left side that needs to be removed. It is held in with one torx T25? screw and then it slides out.

Make sure you check you fit the new lever correctly or the motor may not turn if it is in the wrong position.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

radek93
Posts: 44
Joined: Sat Dec 07, 2019 2:43 pm
Year and Model: S70 98
Location: Home

Post by radek93 »

Is it an outside air flap? I have taken out the cabin filter and flap is moving normally.

scot850
Posts: 6561
Joined: Mon Apr 05, 2010 2:46 pm
Year and Model: 2000 V70 R
Location: Calgary, Alberta, Canada
Has thanked: 22 times
Been thanked: 309 times

Post by scot850 »

If that is working as it should then I need to have a longer think about what could be happening as it is clearly strange that the system works ok in recirc but not on outside air. I am assuming the filter is clean as you have been in there and checked.

When was the blower motor last changed? Do you get any change in fan speed when accelerating or braking hard?

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

radek93
Posts: 44
Joined: Sat Dec 07, 2019 2:43 pm
Year and Model: S70 98
Location: Home

Post by radek93 »

There are no speed changes, or at least I haven't noticed. The blower is original from 98. The filter is about six months old. I think it started when I had a wet cabin filter after a heavy rain. It turned out that the seal on the casing had come off. I found that the wet filter resisted, so I replaced it, but it didn't work. Now I'm dry and it gives me a problem.

radek93
Posts: 44
Joined: Sat Dec 07, 2019 2:43 pm
Year and Model: S70 98
Location: Home

Post by radek93 »

I checked something. When I give the circulation inside and then the external circulation, but I do not turn on the blower, there is resistance immediately after turning on the blower

User avatar
ZionXIX
Posts: 725
Joined: Mon Aug 11, 2014 2:47 pm
Year and Model: 1996 850 Turbo S/W
Location: Texas
Has thanked: 9 times
Been thanked: 47 times

Post by ZionXIX »

Are you sure there isn't anything in the vent rubbing against the blower?

radek93
Posts: 44
Joined: Sat Dec 07, 2019 2:43 pm
Year and Model: S70 98
Location: Home

Post by radek93 »

I dismantled the cabin filter and when I move the blower by hand, I do not feel it chafing. It is strange that if I do not turn on the blower and give internal circulation, there is "resistance" after turning on the blower. I need to see what happens when I completely remove the filter.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post