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Originally Posted by oliverbutthead
Well, got in it this morning t check and the a/c was blowing cold again. I guess the auxillary fan has nothing to do with it but I thought it should come on when you turn a/c on.
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The aux fan is activated by a temp switch on the receiver/dryer. If the refrigerant level is low, the temp at the r/d will not reach a high enough level to close the switch and actuate the fan. You can confirm the proper operation of the fan circuit by jumping the the temp switch on the r/d. (Not to be confused with the pressure switch, which allows the compressor clutch to engage.)
A/C temp switch:
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1KG0NMHLI1LP0OXXI1&year=1982&make=MB&model=240-D-002&category=R&part=A%2FC+Temp.+Switch