2015 Hyundai Accent - Coolant issue

My i20 Coolant overflowing from expansion tank . Water pump, thermostat and radiator have been changed. What do i do to stop this problem

Have it checked for a failed head gasket.


You might want to have the cap to your expansion tank pressure tested. It might not be sealing properly.

Remove the radiator cap when the engine is cold.


Look if coolant can be seen.

If not, add water until it can be seen.

Start the engine, and as the engine idles, watch the coolant to see if any bubbles begin to form.

If they do, that indicates a blown head gasket.