[V8] A/C confusion

[Intemann, Paul (GE Infra, Aviation, US)]

OK ... I am officially stumped.  Ordered an A/C accumulator for both the
'90 & '94 V8q's from RockAuto.  Both arrived ... but the '94 doesn't
have a "service port" (the '90 accumulator OTOH has 2!!!)???  What
gives?  It plumbed in OK but how the heck to I fill it with only the
high pressure port available (keeping in mind that my 30 lb fill-tank of
R-134 does not generate "enough" pressure to drive sufficient Freon into
the system through that port).  And using the '90 accumulator isn't an
option either because Audi (in their infinite wisdom) decided to upsize
the "upstream" coupling thread diameter in the '94 compared to the '90
and '91's (not sure about the '92 & '93's).  At this point the only
thing I can think of doing is getting myself 3 of those "small" R-134
cans and using their (hopefully) higher packaging pressure to get the
required amount of Freon into the system.

Any other ideas?

Thanks in advance,

Paul

'90 V8q auto
'91 V8q 5-speed
'94 V8q 4.2