Temp gauge goes up when a. C. Is on ,goes back to normal when you start moving again ,no smoke or steam

My dashboard lights go off when I turn on the headlights. Just did it tonight. What could it be? A fuse?

Reverse won’t go up a steep drive when cold.

While taking off from stop light engine started knocking. Pulled over ,no engine light on, oil ok, tried to drive home slowly as it didn’t knock going slow. Then engine quit. Towed to Kia dealer. They… 

Brakes seem to come on by themselves after a short while and car is warm. Then will seem to slowly release,