In my experience, most modern cars are designed to run the A/C in the Defrost/Defog modes. This does two things. It dehumidifies the air before it is heated and sent to the windshield, and it helps to ensure that the A/C is run occasionally throughout the year (keeps the seals from drying out, etc). Without the A/C on, the warmed moist air actually fogs up the window more - at least until the glass gets warm enough to reduce the fogging. According the vendors I contacted, some DeLorean Mode Switches are designed to do this, and some are not. It may have been the later models ('83s ???) that ran the A/C in the Defrost/Defog mode. I tried for a couple of months to get one of these elusive switches from the vendors, and finally gave up. Now I just run in the Bi-Level mode - which isn't nearly as good at defrosting/defogging. If anyone can figure out how to modify a mode switch (or the connections / wiring) to get the A/C to run automatically when the Mode Switch is in the Defrost position, please let us know. Thanks Gary IN2TIME To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/