2.5 coolant leak
 

So, I changed the front engine mount, and whilst doing this I had to undo the coolant hoses. Drained the coolant system. Refilled using the ‘’burpe’’ method... all fine. Cycled a few times from cold and adjusted the level just under max.

After driving for 20mins I got a major coolant leak towards the back of the engine / gearbox area.......:eek:

Any pointers?

Need to get back under the car. There’s no coolant lines back that way other than to the oil cooler.
Given you disconnect the coolant hose , I’d start there. Coolant can run and look like it’s coming from areas that it isn’t.

You don't have a "leak", you have a "dump" from the coolant overflow due to an air pocket somewhere in the cooling system. You didn't "burp" it well enough.............

The vacuum controlled valve at the side of the trans towards the rear had split. Funnily enough its a Porsche 928 part. I had 4 on the shelf.

I know how to bleed these systems. I even cycled it twice from cold, and adjusted the level. And the coolant overflow is on the other side.

Hoses are way forward. This is rear muffler area.