If you have the 3.1L V6, you will find all three coils mounted to the ignition module on the left side of the engine block (front of car side) directly below the exhaust manifold. Remove the air cleaner assembly, then electric cooling fan to see them. Use a 10mm socket on three mounting bolts to remove the entire assembly from the engine block.
1991 Corsica its under the trottle body
For a 1991 Chevrolet Corsica : My Chilton's Auto Repair Manual shows : ( 15.6 U.S. gallons )
It doesn't have one, it is distributorless.
13.6 gallons
Green coolant (prestone, etc)
You have to take the door apart
Depends on which engine it has. Try a Google Search.
16.5 to 17.1 gal
Remove the wiring harness from the back of your 1991 Chevy Corsica turn signal. Remove the turn signal retaining bolts. The entire turn signal will come out. Reverse the process to install the new turn signal.
As soon as you pop the hood, it should be to the left of the engine. it is visible from top view.
if its a manual transmission its attached to the clutch pedal housing if its an automatic its the shifter
its behind the coil packs on the back of block