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Q: low pressure port location? on 1991 Mercedes-Benz 420SEL

Hi,

Looking for the low pressure port to recharge the AC, but don't know where it is located under the hood. Would be really helpful if someone can provide a picture to pinpoint the location. Bty, already converted to R134a system.

Thanks in advance.
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ON 1990 IT IS ON THE BIG HOSE ON THE DRIVER'S SIDE ABOUT HALF WAY BACK FROM THE RADIATOR.
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