My 300TD Wagon is not blowing cold. I put a new compressor on a couple of weeks ago and vacuum tested the system for leaks....which it Passed. Unfortunately the center vents do not work, and the outer vents only blow cool on hot days. Is there a temperature Blend door that is prohibiting COLD air ? Is there a relationship to the center vents being inop ? I have heard that this problem could most likely be from a vacuum control module behind the dash...possibly accessible with glovebox removed ??? Can anyone comment on this ? Thank you.