Coolant leak... cant find it

[BigWilko]

So, my car is currently in the garage... in pieces. The mechanic is looking for the leak/ signs of the leak. There is coolant all over the flange of the sump housing but he cant find where it's coming from. Not the water pump or anywhere around it. When i popped in he had the A/C compressor off so he could see a little better around that area... but nothing. Even got my head in there myself but couldn't see anything. Where's the EGR cooler and could it be that @Critch ? is its location in that area?

[paulvectrac]

think you need to pop and see me mate

[Critch]

It's located in the centre of the "v" mate

so upper manifold off and pipe work.
Fuel rail etc.

[BigWilko]

Hmmm, well, there's no sign of coolant running down that side of the block...... Head scratcher

[Ben50n]

Have you checked the overflow bottle, it may be leaking and running back down the pipework? Or have a very small pin ***** leak that only leaks when the engine is warm and up to pressure?

[BigWilko]

Overflow bottle? He's also run it up to temp twice. We cant even see any evidence of where the fluid is even coming from. It actually looks like it's coming from the sump..... but that's impossible. It's also had another head gasket check (came back fine) and another pressure test. Slowly leaking when it's pumped up to .... maybe 3 bar??? (cant remember exactly)

[Critch]

Defiantly not water pump?

can he see any core plugs around. Maybe one if them is warped.

Not running externally from head joint?

[BigWilko]

He says he cant see any signs of leaking from the pump. I'll ask him to check the core plugs (whatever they are). The place where the coolant leaked coolant is resting is under the coolant pipe that runs behind the rad just under the slam panel. That looks like the only place it could be leaking from, but the pipe is dry

[Critch]

Core plugs are little plugs that are put in block so should the coolant freeze they pop out rather than damage block.

Not sure where snouts their located on that block but its a possibility

the big metal pipe are you on about by front head?
mine had a slight weep from where the metal & rubber pipe join. A new jubilee clip solved that

[vmb2722]

Bleed screw maybe!?