Technical Thermostat video?

[DaveMcT]

The first item on the video is exactly what I have. The coupling is (was) working fine. I just need to separate it for doing other work on the engine.

There's no pressure in the line because I unscrewed the male end from the thermostat housing. The coupling turns on the "peg", but I still can't loosen it. I agree pliers are a bad idea. It's probably a dead coupling with chewed O ring or some such. I'll find a supplier sooner or later. I have another two on the fuel system which also seem to be stuck.

Edit - eBay has a few from China though nothing even purporting to be located in UK.

 

[DaveMcT]

I’ve got it apart. I had to use pointed circlip pliers too (carefully) lever between the stop rib and connector body. It’s clean under the O-ring so should clean up. But the end is rough. Clearly even coolant isn’t ”that” protective.