So I've been having some strange overheating issues, the engine and heating are absolutely fine, it's the dsg that was flashing the block of death every time the weather is hot. I drained the coolant, flushed out the dsg oil cooler refilled and it seemed better but still eventually flashed the block of death, so I had been driving around with the heaters on Hi. The electric pump runs when the cars turned off, and also works when it reaches high temperature, so it wasn't that. So today I decided to drop the coolant again and tackle the water pump. I found my issue.