blown fuses, dirty switches, bad relay, broken poer lead to switches.
If all the windows quit working you need to look for a blown fuse in the fusebox.
18436572 1357 r on drivers side of engine 2468 r on passengers side
Check your fuses.
The blend door actuator may not be working.
Drivers side front to rear 1, 3, 5. Passengers side front to rear 2, 4, 6.
Power windows I assume. Check the fuse. If it is still good, it is probably the drivers side master switch that is bad.
Cylinders #1, 3 and 5 are on the drivers side, front to rear. Cylinders #2, 4 and 6 are on the passengers side, front to rear.
On the 4.3L it is located between #3 & #5 spark plugs on the drivers side of engine. my 1992 4.3 is on the passengers side of engine can , my 1997 4.3 is on drivers side this is the location of the one that goes to the Temp.gauge.
According to my searching, for a 1999 through 2006 Tahoe, the locations are: 1 - Drivers side, Upper ball joint 2 - Drivers side, Outer tie-rod end 3 - Drivers side, Lower ball joint 4 - Drivers side, Inner tie-rod end 5 - Drivers side, Pitman arm (at relay rod) 6 - Passengers side, Idler arm (at relay rod) 7 - Passengers side, Upper end of idler arm mount 8 - Passengers side, Inner tie-rod end 9 - Passengers side, Lower ball joint 10 - Passengers side, Outer tie-rod end 11 - Passengers side, Upper ball joint Source: this post: http://www.truckmodcentral.com/forums/showthread.php?t=1320 It is complete with helpful pictures. Enjoy!
Fuses or the power window relays.
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Yes, it should be located under dash on drivers side or on passengers side under dash to the right of the console