This isn't an easy job since there isn't a good explination of how to remove the moulding all around the headliner. Take it to a trim shop.
Actually there is a good explanation. I just removed mine last week. First, unscrew and take off both visors. Also unscrew the dome light, mine was tricky, I had to pop it off after I unscrewed it, take off the clip holding the wires together so that the dome light won't be in your way. Next you'll want to take off all the trim around the headliner. You can start on either front or rear of the car, your choice. but either way you are going to have to unscrew a few screws to get them off. Now your trim should have plastics clips as well, you should be able to just pull them off but you might need to pry with a screw dirvier, and don't be afraid to break one, you can buy more at your local automotive store, autozone is always good. the middle trim should just pop and slide off. Finally, when taking the molding out, be careful because mine was very fragile and will tear easily.
If we are talking about valve lifters, remove cylinder head and pushrods and lifters will be excessable.
My 91 Cavalier (RS 2.2L) doesn't have one but my 95 does 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.
for a detail answer, log on to Autozone.com and enter your car information. They have a very comprehensive website. I was very impressed
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.
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.
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.
Bad heater core.
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.