My 2004 GC Larado did not blow cool air out the dash vents. On research I was advised to check my cruise control to determine if it was a vacuum leak. The cruise control did not work, so I proceeded to attempt to locate the vacuum problem. Nothing visual, so I tried the spraying suspected areas with carb cleaner, with no sucess. I started unpluging the vacuum lines while the engine was running. I also played with the mode door actuator under the driver's side dash above the transmission tunnel. I did not think I found anything, but the AC is now blowing out of the front vents. The cruise is still not working. Does anyone have any ideas or where I can find a diagram of the vacuum system on this vehicle. Any other suggestion of how to locate a vacuum leak would be appreciated. All my explorations has been under the hood.

Thanks

Scott:icon16:

Double check the vacuum hose for leaks - the one going to the intake manifold.
(You can also check actual engine intake manifold vacuum with a vacuum gauge.)
If you're sure there is no leak it may be the cruise control servo motor or servo vacuum lines.
The speed control servo assembly/vacuum line is attached to a bracket located below the battery tray.
Sorry no diagrams.

try this on all your cauum hoses you can see spray carb cleaner on the while running that moter will idle up higher when you hit vacum...

try this on all your cauum hoses you can see spray carb cleaner on the while running that moter will idle up higher when you hit the vacuum leak