Tracked it down to this black plastic unit on the right-hand side of the engine - any idea why it could be leaking and how to fix it?

 

https://youtube.com/shorts/Fi-sOWHeajM?si=8czzOAeKgUkgHZE7

 

If it helps - it's this part (hard to see - so circled in red).

 

It seems to be leaking between this part and where it's mounted to the engine.

Edited 29 May, 20242 yr by SimonJC
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Hi

 

Hard to see, but I think it might be the (plastic) thermostat housing.  This has an aperture that mates to a correspunding one in the block, with an elastomer seal which could have failed.  On the outside are a number of stubs for coolant hoses.

 

If it is the thermostat, this thread might be relevant: