Cooling Issue

Whenever I change my coolant,I always put my 73 Dart up on my metal car ramps for 2 reasons....one to aid in draining system through petcock and more importantly to elevate the car nose to get air bubbles out of the system as car is warming up with new coolant in and rad cap is off....it works for me every time. Try it and see if it solves your problem...Good Luck 318MG