My water pump has gone out and needs to be replaced on my 1986 5000. I need to know if anyone has any idea what a grinding noise could have been when when I last had the car out. It sounded kinda of like a chain making a noise while the car was running. This noise started the day I parked the car. I knew the water pump was going bad, but I was still driving the car making sure everyday there was plenty of fluid in the car. I parked it when this noise started. Any ideas?