bschelle Posted May 22, 2007 Report Share Posted May 22, 2007 My 99 Deville blows cold out of the defroster instead of the floor vents. What could it be? Link to comment Share on other sites More sharing options...
KHE Posted May 22, 2007 Report Share Posted May 22, 2007 You have a ruptured vacuum line in the diverter system circuit. Check for a rub-through condition below the battery tray. Also check the vacuum lines from the AC Programmer behind the glove box. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
bschelle Posted May 24, 2007 Author Report Share Posted May 24, 2007 Thanks for the heads up Kevin! I will post my findings. Link to comment Share on other sites More sharing options...
rmac-etc Posted May 24, 2007 Report Share Posted May 24, 2007 For what it's worth, my 95 etc was doing that (along with the parking brake failing to auto-release) and the vacuum line that failed was against the passenger side wheel well near the firewall. Just another place to check if it's not where KHE suggested. Link to comment Share on other sites More sharing options...
bschelle Posted May 24, 2007 Author Report Share Posted May 24, 2007 I didn't see any problem with the line going down the frame by the battery. I disconnected the vacuum line check valve by the firewall and I could hear the air rushing into the accumulator so I think it is getting enough vaccum. The air going from the dash vent to the defroster vent is intermittent. But it does go to the defroster more than the floor vent. Should I just assume it is the AC Programmer or is there a way to test it? Do I have to remove the dash to replace the programmer or am I not reading the FSM correctly? How about routing a direct vaccum line to the vent motor and bypassing the programmer? My parking brake is releasing as it should. Link to comment Share on other sites More sharing options...
Ranger Posted May 25, 2007 Report Share Posted May 25, 2007 No, don't assume that it is the programmer, they are expensive. Pull the vacuum line at the firewall and put a hand held vacuum pump on it to see if it will hold pressure. If you don't have one, just suck on the hose and when you create a vacuum, plug it with the tip of your tongue. If it does not hold a vacuum, there is a leak somewhere. A stethoscope will help greatly in locating it. Link to comment Share on other sites More sharing options...
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