Well...that is probably one of my issues. Just had my w124 engine replaced and found out today they converted it to R134. It wasn't blowing cool today so I went and charged it myself. However, it would only take so much charge and I couldn't get it into the optimal "blue zone" on the guage. It does blow very cold though. Not as ice cold as it was before but cold enough. Could this have anything to do with my auxillary fans not cooling properly and engine temps running higher on the newly installed engine?