When I did this on my Sunbird (same car really) I had the seats out of the car. I had to stand on the seat bottom and very quickly and firmly pull straight up on the head rest. There's no button to push or anything special you have to do. Just pull very quickly and firmly straight up....they'll pop out.
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
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.
To replace the thermostat on a 91 Cavalier you need to drain the radiator. Remove the top radiator hose and water inlet. Remove the thermostat from under the inlet. Install the new thermostat and reinstall the inlet and hose. Fill the radiator with fresh antifreeze.