Hi All, Just asking on behalf of a mate with a VT V6, he has been having a bit of trouble with the cooling system lately, in that the car isn't overheating or showing anything abnormal on the gauge, but a few times when he has turned it off, you can hear the coolant boiling at the overflow tank, it basically sounds like a kettle... It has also dumped a fair bit of coolant out of the reservoir tank overflow too. Just wondering if anyone has any ideas on what could be causing this to happen? We don't think the reservoir tank is too full, but the issue seems to be happening intermittantly. Checked the radiator last night and there was still plenty of coolant in there, but we did have to top up the overflow tank with about 500mL of water. Any ideas would be appreciated!