You have to drop the subframe
Yes
on the passenger side of engine left side front in front of battery
Built in the fan blower/motor.
It sounds like it might be the fan motor .
It depends on the motor im not sure if the eldorado ever came with a 4.9 but i know on my eldorado it was underneath the intake manifold...which involves taking the fuelrail off and is not something i would recommend doing by yourself if your not a mechanic but if you do make sure you change the injector o rings because leaking after this is common and can lead to a bad motor fire
I believe the starter motor sits in the galley under the intake manifold.
replace that black box on the wiper motor or sometimes you have to replace the motor itself
it is on the drivers side of the engine compartment in the front of the motor when you start the motor you will see a small belt turnig and you will need a specail tool to get the water pump out
Under the dashboard on the passenger side. 3 7mm hexhead bolts.
check fuses?
In front of the motor
very simple task...first remove the rear seat, there you will see the motor, you should be able to take it from there.