Coolant fluid gets pushed back into radiator tank cause pressure to build.

What is your question?

The coolant fluid gets pushed back into radiator tank. Causes pressure to build in radiator tank. Which leads to overheating of engine.

What makes this problem better or worse?

The car doesn’t overheat when driving at night or outside cool temperature.

How long has your 2006 Mazda 3 had this problem?

2 weeks.