My 2000 v8 overheated about 2 months ago then fine until recently, now it is doing it again. I found the thermostat hoop that holds the rod completely broken in half. I replaced the thermostat and bled the system but still overheating. I am going to bleed it again but have a feeling I will need to replace coolant tubes. How much do all the tubes cost? Previous owner replaced degas bottle within the last year. Also the heater has never been great but now it doesn't work atall.