I just changed my fluid and followed the manual exactly. After draining, I filled up the reservoir to the Max line and started the car. It was making a pretty bad metal sound after going back and forth a few times to cycle the fluid. I looked at the reservoir and it was bone dry. It was also whining pretty bad at first then got better after I added more coolant. It still has a slight whining to it at high rpm. So, is it dying? Is it dead? What could have gone wrong?