vacuum bellows ventilation

[rully]

...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

[TonyS9]

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?

[CharlesStevenson]

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.

[Blacksmith]

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!

[Laird Scooby]

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!

[Blacksmith]

I think this may be an older car than what you show. I have attached a pic of the three, if it works