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R134a
Check the manufacturer's routing sticker under the hood.
A 1998 Jeep uses R134a.
If that option was chosen yes.
Sounds like you cooling fan is not working.
The system probably needs a recharge.
Take it to a professional, you have neither the tools or the knowledege to do this.
Most of them, no.
I had one of these on a 1991 Wrangler and if I remember correctly it had 3 speeds. i currently have a 92 and it dose have 3 speeds
You don't. It isn't user servicable. You replace the compressor.
your blower resistor is going bad
The 4.0L Jeep does not have a timing belt, it has a timing chain.