My 91 Cavalier (RS 2.2L) doesn't have one but my 95 does on the left side of the drivers seat.
if it is the same motor yes, but some may have different mounts or wiring plugs
Need more information
The starter on a 91 Chevy cav. is located at the lower front end of the engine. You can get to it better by jacking the front of the car and attacking it from underneath.
Perhaps it was hit by a meteorite. Check for fuel and spark.
Bad heater core.
The hydraulic clutch on a 91 Chevy Cavalier is bled by slowly pumping the clutch and releasing the bleeder valve. The valve is closed and the process repeated until all air is removed.
I have a '91 Cavalier 2.2L My flasher is located behind the fuse box to the left of the steering column. The flasher is mounted against the firewall.
fuel pressure reg throttle position or ASD relay
23 City 32 Highway 27 combined http://www.aboutautomobile.com/Fuel/1991/Chevrolet/Cavalier
Some have it and some don't. My 91 doesn't but my 95 has it on the left side of the drivers seat.
Remove it from the car OR It can be flushed by a knowledgeable person with the correct equipment.