The question you ask is too involved for a proper answer. You need to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
Dexron 3.
The 1989 Chevy Cavalier could be either a 2.0L 4-cylinder or a 2.8L V-6.
No it does not.
185/80R13
autozone webpage
need to know which engine you have
To change the heater core on a 1989 Chevrolet G20 Van, first, disconnect the battery and drain the cooling system. Next, remove the dashboard and the heater assembly by detaching any necessary screws and bolts. Once the heater assembly is out, you can access the heater core, which is typically secured with clips or screws; remove these to take out the old core. Install the new heater core in reverse order, reassemble the heater assembly and dashboard, refill the cooling system, and finally reconnect the battery.
Would have been built for R12, can be converted to R134a.
Make sure the 1989 Chevrolet Cavalier horn fuse is in working condition. Make sure the positive and ground wires on the horn are tight and free of corrosion.
How do you change the heater core on a 1989 Oldsmobile Cutlass Ciera? or where can I get the Info on replaceing it
The 1989 Chevrolet heater core can be found behind the kick plate. You will need to remove the passenger side kick plate in order to access the heater core.