Coolant tank
 

I am a bit confused here. I have a small top up tube for the coolant and also a cap on the engine for the coolant. There is also a button on the cap which when pressed and the car is warm forces coolant back down the pipe and drips all over the floor. I am a bit concerned as I dont want the car to overheat.

Thanks

The tank is a header tank, the upper most outlet of this leads (via a rubber tube to a small metal pipe that runs over the top of the radiator to another rubber tube) to the expansion/ overflow tank (this is next to the battery).

I think from your description, the above is not connected up. ;)

This is how mines connected but whats the button for on the top of the header tank cap. When pushed and the car is hot it skwirts coolant into the expantion tank. Anybody