Engine overheating in 1987 Jaguar XJ6

My Jaguar started overheating recently when on the highway with the AC on. It will r un hot a when I stop it boils the water out. I replaced the rad. cap, and removed the thermostat, no help. Hoses and fans seem fine. Need ideas and/or repair shops in the Rockport, Texas area.

Radiator plugged? Bad water pump?

Here’s a reference to a few notes I wrote up for an earlier poster with similar problems : http://community.cartalk.com/posts/list/1367409.page