This is a very involved job. It requires removing the steering wheel and the entire dash. You should check out a reliable service manual before considering doing the job yourself. If you do decide to do it, it's a good idea to replace the heater core as well, even it's still functioning. Have an assistant on hand to assist in dash removal. Good luck.
No.
Yes
Yes.
Yes
yes
Not exactly. The body styles are different. A 1991 Jeep Wrangler is a YJ as a 1999 is a TJ. t
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A 1999 Jeep does not have a cabin filter.
No.
NO, you will waste your time and money.
A 1999 Jeep uses R134a.