water pump ,thermostat.? So I spent $1800 on repairs so far and now its not starting at all. It started and then the car died on me and when I went to start it again it started but it wouldnt stay started and I kept hearing this slight knocking before this the low coolant sensor kept coming on and then going off again while I was driving it but it had coolant in the tank and oil what could be the problem and is it fixable? I dont want to give up on this car I owe almost $3000 on it between my fiances parents and my parents for funding the car what should I do?