Just to confirm, you are using a borescope to look in the engine and are seeing coolant at the top of the chamber?
If so, you can try the head gasket sealer but I have never had any luck with it once the gasket is already leaking. They seem to work better at catching and plugging small leaks but not once you notice loosing coolant.
Here is a guide that goes through a head gasket test just to confirm this. However, the only proper fix that I have experience with is replacing the head gasket. Again, you can give it a shot but I would not be overly optimistic. Lastly, just because the oil and coolant have not mixed yet doesn't mean it is not a head gasket. The leak may be small enough that it is only leaking into the cylinder and it is getting put out through the exhaust. Is it smoking at all?
Let me know if you need more info and we can go from there. Thanks
Monday, March 30th, 2020 AT 10:16 AM