I have purchased an ACM evaporator with preassembled expansion valve for my 94 E320 (car equipped with factory installed 134A system). I would assume the expansion valve has been pre-torqued by ACM and the o-rings between the expansion valve and the evaporator lines have been moistened with either refrigeration oil or Nylog. But there is no such information provided with the unit. I am wondering if I should go ahead and pull the expansion valve off of the evaporator now and make sure it is correct before I begin the installation. I do not really see why it would ship “preassembled” if it was necessary to do the above, and I hate the idea of breaking the factory seal unless it is necessary. I know the expansion valve can be pulled afterwards if there is a leak at the evaporator lines, but I would obviously like to eliminate that possibility upfront. Can anyone here shed any light on whether this is necessary? There is nothing in the archives on this specific question. Many thanks. John Downey