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Yes, you can use the schraeder port on the accumulator tank. The accumulator is on the low side. The high side fitting should be on the back of the compressor, and I'm assuming that you have a Diesel Kiki compressor (will say DK something or other on the top).
(Nomenclature: receiver/dryer is used on different systems where it is located on the high pressure side. Low pressure dryers are referred to as accumulators.)
Be VERY careful with the interdynamics kits. I'd sooner not even bother using one unless you are really at your limit. You've read Dave Urban's page on the conversion, which is pretty much by the book as far as the Volvo 940 is concerned. The biggest concerns are the contamination from old mineral oil still in the system, and the lack of a new suction accumulator and R134 orifice tube.
You will get the system to work (albeit poorly) using that kit, but it won't work for very long without some sort of issue. It will likely be related to compressor failure, although the DK compressors seem to hold conversions very well. I'm speaking from having seen the inexpensive conversions done in the past. Pressures are usually way off, performance stinks, and longevity takes a hit.
I've never heard of anyone who has had remarkable results from Interdynamics kits over the long term, unless they've supplemented the kit with a bunch of other parts and service. I'm not trying to steer you away from getting cool air in your car; who WOULDN'T want that? But if you have the time to do it right, figure out where the system might be leaking (high side pipe on the frame rail is a big one, as are all the O-rings) and do the Volvo conversion kit. For less than a hundred bucks for the Volvo kit, you will have A/C that you can depend on, and that cools virtually as well as the factory R134a A/C systems in the later 940 series.
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1992 940 wagon, 72k
make people envious; smile often.
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