You shouldn't have to replace the mode switch. They can be disassembled and lubricated. If the rubber diaphram disc is damaged it can be replaced in a kit. Check the "O" ring seal under the mixture unit for the pipe to the idle motor. Check the injector seals. Close the 3 brass screws. It sounds like the idle motor circuit is not working, it is not controling the idle speed. Turning on the A/C should not affect the idle speed. In fact that is exactly why there is an idle motor control, it is supposed to hold the idle speed constant no matter the load on the motor from the alternator or the A/C. David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, Louie G <louie@xxxx> wrote: > I was just wondering if anyone could confirm to me that my vacuum hose routing into my vacuum solonoid is correct. I have the line with the u-shaped bend connected to the port closest to the electrical connector. > > Also, my mode switch hisses when I turn it while the car is not running. That means I've got a vacuum leak there, right? The car is idling at about 1000-1100 rpms when it gets warm. When the car is cold i 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/