2.5 coolant leak

[993turbo]

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.......

Any pointers?

[dghii]

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.

[JFP in PA]

Originally Posted by 993turbo

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.......

Any pointers?

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.............

[993turbo]

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.

[993turbo]

Originally Posted by JFP in PA

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.............

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.

[993turbo]

Originally Posted by dghii

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.

Hoses are way forward. This is rear muffler area.