HELP! Big coolant leak!!

[Steve Tinker]

When you remove the coolant cap and oil fill cap, prize up the plastic cover and underneath there is a round valve with a chrome D shaped lever attached. Just lift the lever into the vertical position and leave it there for a couple of days or 3-4 complete heat cycles (cold to full temp). After each run and then cooldown (say overnight) you will probably find the coolant level has dropped as the air is purged. Top up as required with the correct mix of correct coolant.
If you are still not sure, use the search function for pictures - it works quite well believe it or not....

[geraintthomas]

Brilliant, that's perfect. Thanks everyone for the information, hopefully it'll be cured with the newer cap and purging the air.

There's a Porsche dealer next to where I live (lucky me), and I gave them a ring. They said £9 for 1L of Porsche 50/50 coolant, and £18 for a brand new coolant lid with the part number ending in .04.

Perfect

[geraintthomas]

So I topped it up with Porsche coolant and it's been absolutely fine since. I've just replaced the radiator cap with the revised one that ends in 04. Hopefully that was just a one off

Thanks guys.