The center vent function is controlled by the mode switch. Either the maze is indexed wrong or is the wrong one entirely. Check the resister pad in the evap box for speeds 1 & 3. The coils may be broken or the connection broken. Warren at DMC Joe OBrien wrote: > I recently replaced my mode switch, blower motor, blower motor > relays. Circuit breakers, and vacuum solenoid for the center vents. > > On max ac, I get the center vents to function, but if I switch it to > vent or heater, the center vent closes. ??? > > On my other cars on the heater & vent settings the center vent stays > open, but not on 16851 (the one I'm doing hvac work on) > > Also even after replacing the blower motor, fan speed relays, new > circuit breakers, I still have no 1 & 3 fan speed? > > And ideas on the center vent issues and the two missing fan speeds? > > Thanks, > > Joe O'Brien > > 2524, > 16634, > 16851 > > > > > > > > > > > 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 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/