Need help, replaced the coolant today and drained about 31 ounces out and only put back about 24. I ran the water pump and fans and continued to poor in the fluid until it was no longer taking in fluid. I then filled the reservoir and ran the engine and took it or a spin. Checked the reservoir and it had he same level. Will it take the fluid from the reservoir if there is still air in the system? I'm going to watch the reservoir. Why did it not take more fluid?