In the early to mid 90's all manufacturers were forced to convert to 134A
on the engine. Your best bet is to take it to the shop if you cannot locate them. Sorry
Take a look at the belt that's driving it when the ac is on.
Most likely in the front? Might be covered by a plastic cover so you'll have to take that off to get at it.
all newer vehicles take r134a refrigerant.
What it will cost you to replace the distributor cap on a Pontiac Sunfire will vary depending on if you do it yourself or if you take it to a garage. The cost can be over $100 if you take your car to a garage.
This is a pretty big job. Pick up a Haynes or Chilton manual for the car. It will show and tell what you need to do.
You can replace a timing chain on a 2002 Pontiac Sunfire by visiting a local mechanic and having him take care of it for you. This is a tricky part to change yourself.
Dexron III ATF.
Take it out and put a new one in!
For the sake of safety and for avoiding any leaks, I highly recommend that you take it to a professional. It's not normally REAL expensive to have it done. FriPilot
For the 2002 it was way up under the dash board on the driverside. We had to take the dash off to get to it. Ask at auto zone... they helped us.
5w20