Suganami,
Your car being originally 134 makes it a pretty decent a/c. When I condemn 134 in the 124 cars, I'm speaking of conversions. There are a number of things done by the factory to provide decent performance from 134.
I test drove a '92 300D in August some years ago with a factory 134 system. The a/c performed very well.
Have a great day,
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