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vacuum bellows ventilation

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Old Jan 28th, 2016, 22:36   #1
rully
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Default vacuum bellows ventilation

...nearly everybody driving series 900 volvo sooner or later gets to know the hissing noise from under the dashboard, followed by a poor or nil reaction to the commands turning the knob for the distribution of the incoming air.....
diagnosis:
one or more of the totally 3 vacuum bellows has got defunct.
the problem:
it takes a lot of hours merely to gain access for changing it/them.
the even bigger problem:
the volvo parts list shows "nla", no longer available!
the part numbers are:
-- 9463040
-- 9463041
-- 9463042

anybody out there who`s got an idea?

thanks, regards

christopher
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Old Jan 29th, 2016, 14:43   #2
TonyS9
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Not if you have no vaccum controls! This applies to AC.

I have spare units in my breaker if you need.

What idea are you asking about?
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Old Jan 29th, 2016, 20:07   #3
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I'd 2nd TonyS9 - only ever had bog-basic heating controls which have, so far, proved reliable.

Perhaps the turbobricks FAQ has some suggestions for you as most / all US cars had a/c I'd expect.
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Old Aug 2nd, 2017, 19:47   #4
Blacksmith
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Default Bellows search

Hey all, new here and came across this post which had recent activity. All 3 of the vacuum bellows in my '96 960 are in need of replacement. Part #9463041 (2) and #9463042 (1). I am having trouble locating them. Any help in locating these would be appreciated as its already apart and waiting on me to finish! Thank you and love this group!
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Old Aug 2nd, 2017, 22:36   #5
Laird Scooby
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Are we talking about these things :



The black row of "balls" on the left in the pic?

Take it apart and fit a new "O" ring seal. Or, take it apart and squirt some RTV sealant into the "O" ring groove, refit the "O" ring and put it back together.

Unless of course i'm thinking of something totally different!
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Old Aug 3rd, 2017, 05:05   #6
Blacksmith
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I think this may be an older car than what you show. I have attached a pic of the three, if it works
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File Type: jpg IMG_1641 copy.jpg (149.8 KB, 37 views)
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Old Aug 3rd, 2017, 08:06   #7
mjk164
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Chris, my 1993 960 2.9 has similar issues as yours but only on one of the servos...and I live with it knowing it will go warm for a few seconds when the manifold vacuum reduces, but it soon comes back when you lift your foot off.
There is a full description of how to fix these servos (i.e. direct replacement) but as they are no longer available you can "fix" the old ones. The description is in the FAQ on this site under "HeatingVacuumServoReplacement.htm#VacuumServoRepl acement" and it has very good pictures of the process on a 960. To repair an old servo, you need to get access as described in the FAQ and repair the crack/leak in the rubber of the diaphragm with a little rubber repair sealant or similar. It does work 'cos I've done something similar on another vehicle, but work carefully from the procedure described. Its reasonably easy to get access on the 960.
Have fun!
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Old Aug 3rd, 2017, 12:03   #8
Laird Scooby
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Quote:
Originally Posted by Blacksmith View Post
I think this may be an older car than what you show. I have attached a pic of the three, if it works
Thanks, that clarifies it a bit! Most of us engineer types would refer to them as vacuum servos but i see Volvo have "christened" them "vacuum bellows" just to confuse us!

Strangely they still call the same device (albeit bigger) a servo when it's linked into the brake system.

If they can be dismantled, rubber sheet can be bought cheaply on ebay, measure the thickness of the original and go for the nearest thickness. Wad punches are great for making the right size holes in the middle to attach the pushrod assembly, again sets of these can be bought on fleabay for not many pennies.

http://www.ebay.co.uk/itm/5Pc-Heavy-...UAAOSwYvFZKAX0

Hopefully that's a bit more use than my first post!
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Old Feb 15th, 2020, 23:20   #9
SW960Sipa
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Default In need of exact same parts as Rully asked about

Please ping me if you have any idea of anyone on this planet (I am willing to leave it as well if possible &#128578 still having these three parts - two of 9463041 and one 9463042 vacuum bellows for sale. Many thanks in advance.
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