Try reading this topic, I participated on a day I felt ambitious
Fan topic, including test procedure.
You can test high and low speeds. The a/c always runs the low speed fan, as long as the a/c is functional. Caution: If the a/c compressor is running with no radiator fan, it may blow the R134 in warm weather. Low speed will also happen if the engine reaches the m on normal for a few minutes.
