Mar has been heating up bad, engine coolant has been leaking and the heater went out. I was told that it was the sensor was out therefore I replaced the sensor and it worked cause it was not heating up so I did a tune-up then my radiator water started leaking so it's heating up again and I was told it might be a cracked head and I should work on my valves. does this sound consistent??

95 Teg RS 180K