New owner of 88 560SL with some air conditioning coming out the vent but most through the defroster. Brought it back to the dealer and he said that a major part had to be replaced that would take 20-25 hours of labor and cost total $3500-$4000! Service manager calling me Monday to discuss details, any thoughts or ideas of what I could be looking at? Want to be a little informed when he calls, Thanks.