When driving about 2 months ago I pulled up at a servo and when I came back I noticed the car had dumped all the coolant on the ground so filled it back up then drove for about an hour then it did it again but only dumped about half. Refilled it again and has been fine for the last two months but did it again today.
Was wondering if anyone has any idea why it would do this?
The car had not been too hot before this happening either.
Car is a VX Clubsport. Also would it be a good idea to replace the coolant overflow cap and here can you get them to fit a VX LS1?

Thankyou.