Unhook the battery. Remove the glove box door. You'll see the ECM. Unplug the wires to it. There are four nuts that hold it in. Loosen them and take out the ECM. Reverse the procedure to install. Remember to put your original PROM chip in the new ECM.
You don't. A 1991 Cavalier did not come with airbags.
Behind the glove box.
70 ft-lbbs
Behind the glove compartment.
You don't, you replace it.
70 ft-lbbs
Check the fuse box.
Around 2300-2500 lbs
Chevy dealer, auto parts store, etc.
On the right side of the fuse box
How to remove and install the serpentine belt on 1991 Chevy Blazer with AC?
The refrigerant capacity of a 1991 Chevrolet Cavalier is 36 ounces of R-12 Freon. This is the same for all Cavaliers produced from 1986 to 1993.