Might be a vacuum leak
Press Information until you get to OIL Message. Then Press and hold for 3-4 seconds and it will clear back to 100%
t15 torx screw at the top of the fixture, remove it, bulb sockets press tab and rotate counterclockwise 18/turn
if you are talking about the ac its 175 to 225 depend on outside temperture
Press the trunk button on the dash board or the remote key fob
press info botton until you come upon "oil life" then press and hold the reset button for about 5 seconds
I'm going to assume that it is similar to the cover on the 1997 Deville Concours. In the '97 you simply 'pull up' on the cover. It has prongs that press and snap into receiver ports in the vehicle proper.
Press and hold the reset button on dash
Hit INFORMATION button until oil percentage is displayed. Press and hold reset until display reads 100%
hold off and warm intill gas gage lightes up. the codes will flash out of the gas gage. press off to exit.
To set the clock on your 1994 Cadillac DeVille, turn the ignition on with your key. On the bottom right corner of the clock you'll find the 'set' button. Press the button and immediately press and hold the 'seek' button. When the clock gets to the hour you want, release the 'seek' button. Next, press the 'set' button again and press the 'scan' button, and hold it while it scrolls through the minutes. When it displays the correct minutes, release the 'scan' button.
From the climate control system, which acts as the diagnostic computer. Press and hold the off and warm buttons together. You will see the system 888 then 7.0 then the active codes will start to show. Write them down. You can google amost any code you find. To clear all the codes, press and hold the off and high buttons together.
Just press the red button on your garage lifter, and when the light flashes press and hold the button in your your car until the light flashes again or the garage door moves.