Arthur, I just topped up my AC system with 1 can (12 oz) of R134. Most of the bubbles are gone, but fan still didn't come on. Then again the ambient temperature is only 18 C (65F). So its probably too cold for the preasure switch trigger them. I'll wait for a warmer day.

Yesterday I went to Autozone and bought from them a tool to remove AC schrader valve cores ($.99). Went outside to try it, (I though at least that I can try tightening it) and found out that there is nothing to tighten or to remove. These are not normal schrader valves. The AC knowledgabe guy at autozone didn't believe me and came out to look. He said that its the first time that he sees a non removable schrader valve core.

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'95 E300 Diesel, 264,000 Miles. [Sold it]