There should be a diagram of the system on the cover for the radiator / a/c
condenser - check ETKA for the sticker that goes with your particular engine
code. You'd have to order the sticker, though, and I doubt the dealer would
be able to help you with that one. (The connection looks like the one on my
1980 for the vacuum advance for the distributor - YMMV)
As Dave pointed out, it's best to get a Bentley Manual for working on your
car - check eBay for that. You might also search the Audifans archives for
a "vacuum diagram" with the engine code, or contact someone with a car
similar to yours and ask them (nicely...) to send a photo or scan of the
diagram on the rad cover.
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
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