My car is a 1994 chrysler New Yorker 6cyl.I went on highway for 5min when the car started to over heat. On my way back home very loud pinging, and rattleing under engine started. When I got back home I let it cool down. Then added water, restarted but noise still there, also loss of speed, all gears feel the same.I felt the top hose and yes very hot. Yet the bottom hose I could hang on to for 20sec. I also have heat. Can you please HELP!