Dodge Charger

Pressure test system to see if it holds pressure and if it has a leak wether it is external or internal. Check to see if coolant sensor is good. Check water pump freeness on bearings and no play left/right/up/down. All air out of system? Bubbles can be deceiving as you think all the air is out.

How did you bleed the air from the system ?

On your charger there should be a bleed screw a little after the upper radiator hose. This bleed screw is where you bleed the air out of the system. It looks like a brake caliper bleed screw. Put some clear line on this screw and put the other end in a 20 oz bottle. Keep the hose in an upright position. Open up the screw a little to start letting air or hopefully coolant and bubbles out. Do not start car. With the screw open, open up the coolant reservoir and pour coolant in it. If air is in your system, you should see your car slowly taking in the coolant by the level in the reservoir going down and air or coolant bubbles coming out of hose on the bleeder screw. You can squeeze the upper radiator hose gently a few times and this will push bubbles out and coolant in. Do this process with the car cold and do it until all you get out of plastic bleeder hose is solid coolant. No bubbles. Take your time as this could take upwards of a few gallons if system is empty. 3 possibly. You want all the air out so this is pressurized for coolant to flow. Finish by topping off reservoir and making sure bleeder screw is correctly tight. Hope this solves your issue

I have a van that I recently did some cooling system work and when I was done, I thought I had it full even after running it for a week and I was still half a gallon low. I did not overheat but the reservoir was empty. I had to bleed like I described in the previous post. I had a mini heart attack thinking I had a leak but I pressure tested it and it held and since filling it has stayed at the level after 650 miles. Some cars are self bleeding and some are like yours and mine.