start by checkn the Battery,I would put my lights on to see if they are workn, if they are not then it is your battery. If not could be your alternator.
an ostrich
motor mount
If a 1996 Cadillac Sedan DeVille is making a backfire noise from the engine compartment while at a steady speed, it is probably due to a bad oxygen sensor. The vehicle could also have one cylinder that is not firing or a problem with missing exhaust or the catalytic converter.
I have a 2002 deVille and all I hear is a little road noise (tires). The engine growls only when "pushed". It's a beautiful thing
1995 concorse is making a ticking noise under the glove compartment
Could be a bad wheel speed sensor.
It's loose or it's a bad bearing on 1 of your accessories. try tightening it & see if improves.
If the sound is a loud growling , whining, noise you're probably low on power steering fluid. Now the cause of the fluids loss is WHERE ?
Check all your accessories pulled by the belt. There are a lot of bearings in these accessories that can cause the " chirping noise".
Tensioner pulley for the water pump belt on the opposite side of the motor the other side, not the side with the surpentine belt.
could be a bad cv joint
Front rotors are warped and need to be replaced. Could be an out of round disc brake rotor