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Re: Air Conditioning
Posted by david_prantl (more from david_prantl) on Tue, 7 Mar 2000 10:58:16
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

Bob,

you're probably correct about the SwageLock (or some such) connections not
being re-usable.  However, flare-type fittings use on automotive and
general plumbing applications are not quite like this.  There's no
soft-welding, and material deformation (if any) is so minimal that the
fittings can be re-used several times successfully (in most cases). Visit
the local Home Depot plumbing department, and you will find these standard
flare fittings in gas-stove hookup kits.

In SAABs, I have seen flare fittings on older-model Sanden compressor
connections (900 to '86 or '87, 9000 to '89).  Also, many early 16V models
have a short fuel hose connecting the fuel-pressure-regulator to the fuel
rail.  This hose has a 'banjo' fitting on the rail end and a 'flare'
fitting on the regulator end.  I have heard that people have had problems
getting this particular flare fitting to re-seal after FPR replacement.  I
have not had this problem yet.

Banjo fittings can also be found in other places in the fuel system, like
at the fuel filter and fuel pump, etc..  A late BW37 ATF-cooler oil-return
hose has a banjo fitting at the tranny case end.

O-ring fittings can be found throughout the A/C system, as well as on
ATF-cooler and power-steering hoses.

I don't believe standard flare fittings differ substantially in cost from
o-ring-type fittings.  I imagine banjo fittings are more expensive, and
know that they sometimes require those annoying (read: not readily
re-usable) hard/soft sealing washers. I do believe that standard pipe
fittings (tapered threads) are cheaper.  They are not common in auto
applications, probably because they require proper thread sealant in most
cases (pipe dope/teflon tape).  There is just one that I can think of:  The
0.25' pipe-thread pressure-tap plug on the BW37 auto transmission.  Also,
Townsend's custom early-9000 5-speed tranny drain plugs may be of this type
:-)

Best regards,

David Prantl
david_prantlno39sdcx6spamx782hotmail.com
'84 900S, 5-spd, 210kMi, RIP
'86 9000T, 5-spd, 176kMi
'88 9000S, 5-spd, 137kMi
'90 9000S, auto, 133kMi
'89 900, auto, 115kMi
'68 97 Sonett V4, 76kMi, #000467

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