It is in the gas tank. The tank must be removed. A very difficult job.
You don't. A 1991 Cavalier did not come with airbags.
Behind the glove box.
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70 ft-lbbs
Behind the glove compartment.
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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