2004 cad deville glove box is locked and the key cylinder is gone,how do i open the glove box door

SOURCE: fuse box location

I have a '99 Deville. Had the same problem. In the glove box, there are two toggles for Traction Control and Valet. Toggle the Valet one and try the remote on your key or the buttons in your dash.
For mine, someone had engaged the Valet to "ON" and locked out the remote trunk and fuel door.

SOURCE: unable to insert key into ignition switch

Try this pull the steering wheel as far to the left as possible and while it is in this position try to insert key. Sometimes the steering wheel lock will get in a bind and prevent the key from being inserted. Hope this helps!!!

SOURCE: glove box, LOCK BROKEN IN LOCK POSITION

If the glove box is anything like mine it is a modular piece assembled with screws.... let them break the handle.. get a replacement first from a junk dealer and have the broken part swapped out. Its like a seat belt catch in my 97 deville. The glove box in mine flopped open and the catch had broken and fell down the door of the glovebox itself. The whole door is assembled with philips screws and should be easily removed and a new latch put in.. whoever does it should not cost more than 50.00 in labor MAYBE unless you have a friend that would do it for a beer. I saw a complete glove box on ebay for 40.00 shipping ontop of that .. i saw the latch for 20.00 +shipping.

SOURCE: location for adding freon

add freon to low pressure side . low pressure side is large line with small fitting. high pressure line has a large fitting.

SOURCE: 1992 Cadillac Coupe Deville blower fan runs all the time

The BLOWER MODULE is located on the A/C EVAPORATOR housing located UNDER THE HOOD passenger side firewall. Has 2 electrical connectors. Mounted with 4 screw bolts.Hope this helps