I have a 2016 Chevy Cruze Limted LTZ with 1.4L engine. it had a coolant leak from the water pump. I changed the water pump and now it is overheating. I blead the coolant system 3 times it will driver fine and stay cool for about 20- 25 miles then will start to overheat. it is blowing coolant back out of the coolant reservoir. it was running fine before the water pump was changed and now it seems like it has air in the coolant system. it will have bubbles in the coolant reservoir while the car is running.
Can someone help me to figure our what may be causing this issue? I would think if it was a blown head gasket it would have had the issue prior to changing the water pump and would overheat faster. the system is not leaking anywhere.