Low freon almost makes sense based on not getting cold when compressor is engaged, and I need to get out my guages and check that out. However, I do know that when it intemittently starts blowing cold, I get ice cold air, so low freon would not produce that condition.

You mention a regulator, what part is that?

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Treiberg's Collection: 1981 240D, 1985 300SD, 1992 300E, 1997 E300D, 2005 C230K