why does the coolant go into the overflow tank

it is not a resivior tank it is a pressure expansion tank and as the antifreeze flow through the engine it gets hot and goes through the radiator and the engine fan blows the heat out of it and the boiling hot antifreeze will expand and if it has nowhere to go the engine will overheat

I put water in my 4.0 and it is running hot I change the radiator it is still running hot what could it be

I have a 2000 Ford Ranger 4.0 I put a new radiator in and it still overheats what can I do

I have a Ford Ranger 2009 model 3000cc engine. The coolant would go into the over flow bottle when hot but would not return to the radiator. I got the radiator checked, no leaks were found. I also changed the radiator cap

I have a Ford Ranger 2009 model 3000cc engine. The coolant would go into the over flow bottle when hot but would not return to the radiator. I got the radiator checked, no leaks were found. I also changed the radiator cap