Help me please, My engine is heating up, I changed my thermothat, I checked my water pump by manually turning my pulley manually and it works. However, when the gas pedal gives it a few strokes, the liquid does not seem to circulate in my system. My antifreeze is in good condition.

 

Put a pressure tester on it and make sure your system does not have a leak somewhere. If you are not holding pressure the water will not flow properly. Also how old is your water pump? I have seen old pump impellers rust and the fins become smaller and don't pump as much as they should.