overhearting

Hello world, Town Car 1999 120” limousine. Having problems with temperature gauge jumping to max, coolant warning and loss of power/vibrations. Feels like limp mode. Happens after driving anywhere from 5 minutes to 30 minutes. After restart temperature shows normal and car runs as normal...

I just replaced the water pump which was pretty easy, got everything back together and engine started up no problems. Let it run for awhile watching the water temp, it would climb up about half way then settle down, no issues. I followed the service manuals instructions by filling the coolant...