So I was loging on to ask this same basic question.

I was in traffic today and my 96 Cherokee temp gage was getting over 210. Maybe 217 not sure, it doesn't give much info. I know the fan comes on when I have the A/C.

I know a car isn't over heated until its over heated, but it sure is nerver wracking watching to creap over 210 and keep going.

I'll let you know what I find out.