My nav system and radio wont come on in my 2005 cadillac sts

SOURCE: Can you hook up an iPod to a Cadillac STS 2005

2005 STS4 In the center console there are audio video jacks. Go to radio shack and grab a cable with audio/video one side headphone the other. Plug into your iPod and put the touchscreen setting on AUX. It's on the screen getting to bluetooth

SOURCE: I need a cadillac seville sts 1998 4.3L & 32

Try Item #1 first it is the easiest.
Then Check the small water pump belt, it is not the serpentine belt.
The next step is to either check the Block with the following block tester available from NAPA
The part number is 700-1006
or change the thermostat dealer cost about 60.00 AUTOZONE about 40.00 You will need to purchase the Gasket with which ever you purchase from.

I had written a detailed note and the system dropped it. I hope this helps. coolant system drawing is available from:
http://media.photobucket.com/image/coolant%20system%20cadillac%20sts%201998/Parallax1/NSCoolingSystemCircuit.jpg

SOURCE: how do you remove the door panel on a 2005 cadillac sts

2 screws located under trim panel at pull handle where u close door another screw at handle (door open) under trim cover. then plastic retainers hold panel to sheet metal. slide flat bladed preferebly plastic tool between trim and door and pry out words at retainer

SOURCE: how to change an air filter on a 2005 cadillac STS

REMOVE THE 2 WING NUTS ON TOP AIR FILTER COVER.THEN TILT COVER UP AND REMOVE THE FILTER..

SOURCE: how do i replace headlight in 2005 cadillac sts

Two hour job in your driveway. Lift the side needing replaced, remove plastic clips and the wheel liner. Unbolt the bumper face starting from the wheelwell and working in. When replacing the passanger side, remove the bolts holding the fuse box in place and move to allow more room. the replace is made through the wheelwell reaching in.