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1997 Volvo 850 Air Cleaner Vacuum Hose

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

1997 Volvo 850 Air Cleaner Vacuum Hose

Postby ryan954 » 07 Jan 2009, 04:58

The black vacuum hose on the back of the air cleaner broke. Do I need to fix it? What will happen if I do not fix it? Thank you in advance for your assistance.
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Re: 1997 Volvo 850 Air Cleaner Vacuum Hose

Postby larryh » 08 Jan 2009, 02:10

nah, all that stuff is just extra you don't need it.
8)
I dunno what it's for, but I will make a wild guess and say you should fix it. whatever it is.
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Re: 1997 Volvo 850 Air Cleaner Vacuum Hose

Postby Ozark Lee » 08 Jan 2009, 02:24

I can't tell from the picture but the later versions of the N/A models had a vacuum controlled airbox thermostat that went to the airbox.

At its best it just results in a vacuum leak (bad) and at its worst it results in a vacuum leak and the airbox thermostat being forced to the hot side (very bad).

...Lee
'94 850 N/A
'96 850 N/A
'96 Platinum Edition Turbo
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1986 740 GLT
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Re: 1997 Volvo 850 Air Cleaner Vacuum Hose

Postby rbtyndall » 12 Jan 2009, 05:00

On my 94, that hose controls a valve that pulls air in off of the exhaust manifold during cold starts. You can choose not to fix it, but make sure you plug the vacuum hose.
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Re: 1997 Volvo 850 Air Cleaner Vacuum Hose

Postby MadeInJapan » 12 Jan 2009, 05:36

Duct tape man!
put it on where it broke off from and duct tape it for the time being. If you had a short piece of silicone hose, just wide enough to wedge the broken piece into and then zip tie it and then side the other end onto the air box and zip tie it too, you'd be golden and wouldn't have to replace it, ever. That's a return hose for some exhaust I believe so it's not a huge deal but non-the-less, it would create a small vacuum leak. If you don't have a turbo, it's not that big a deal.
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94 850 Sedan NA Drk Blue/Tan
'00 V40 Purple/Grey Mobil-1
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Re: 1997 Volvo 850 Air Cleaner Vacuum Hose

Postby gaohua97115 » 04 May 2011, 17:27

Hello,

I have a v70, has the same problem. the vacuum hose broke down. I don't know how the hose connect . one end connects onto the air cleaner box, where the other end?

thanks
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Re: 1997 Volvo 850 Air Cleaner Vacuum Hose

Postby jblackburn » 04 May 2011, 17:36

Hello,

I have a v70, has the same problem. the vacuum hose broke down. I don't know how the hose connect . one end connects onto the air cleaner box, where the other end?

thanks

Vacuum tree near the intake manifold.

Near here; sorry, don't have a good picture of it on its own
Image
Look for an unused, uncapped port.
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


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Re: 1997 Volvo 850 Air Cleaner Vacuum Hose

Postby gaohua97115 » 05 May 2011, 19:27

Thanks for your answer,

two vacuum hose connect to the air cleaner box. one is white, the other is black, I know how the white connect. how the black connect beside one end onto air cleaner?

thanks
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Re: 1997 Volvo 850 Air Cleaner Vacuum Hose

Postby jblackburn » 05 May 2011, 19:45

See this thread - sounds like you're talking about the exact same hose as this guy:
viewtopic.php?f=1&t=38839
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!
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Re: 1997 Volvo 850 Air Cleaner Vacuum Hose

Postby manzo740 » 25 Aug 2011, 15:45

on my 98 v70, the black vacuum hose connects the top of the airfilter besides MAF to the left underside of airbox (if facing engine). hope that helps.
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Re: 1997 Volvo 850 Air Cleaner Vacuum Hose

Postby cn90 » 25 Aug 2011, 16:01

It is a very very easy fix.
Fix it and move on.
The parts are cheap too, a couple bucks.
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