Actually "sophisticated valving" isn't new at all. They're known as Thermal Expansion Valves. Every household refrigerator and central or window A/C unit has had them for decades. Most car manufacturers other than GM used them too. They yield much smoother and more precise freon metering than a fixed orifice tube. One of my long term projects is to convert my DeLo to such a system. I can feel my OEM cooling fans cycle even at highway speeds! Bill Robertson #5939 >--- In dmcnews@xxxxxxxxxxxxxxx, "David Teitelbaum" <jtrealty@xxxx> wrote: > Just because you have new seals doesn't mean they can't leak. Some > venders supply seals that fit rather loosely. Wrapping some teflon > tape around it before you reinstall the injector may help. If the > supports are leaking I guess you could either put a bead of silicone > around it or you could remove it and silicone it back in. The A/C > should cycle, in fact it has to if it is properly set up. If it isn't > cycling here are some of the things to check: > Low pressure switch adjustment > Overcharge of refrigerent > Obstructed condensor or evaporator > A problem with one or both cooling fans (wrong direction, loose fan, > inoperative motor) > Heater fan not rotating in the correct direction. > There are other, harder to check things, these are among the most > common causes. This A/C system does not have the more sophisticated > valving that newer systems have to prevent the evaporator from going > below atmospheric and frosting over. To prevent that it has to cycle. > David Teitelbaum > vin 10757 > 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/