I tried draining my coolant today, I had to replace the upper and lower radiator hoses so AI thought I might as well, but the coolant level in the reservoir has not changed, despite about 7 litres being drained. Am I missing something? I took off the radiator cap, ran the car for 5 minutes with the heater at max and then turned car off, and opened the drain plug. After replacing the hoses, I filled the reservoir up to a little over full and started the car again (cap still off) and the coolant level still hasn't changed! HELP please. It's a 1990 mx6 aws turbo.