Hi,
I attached a picture below of the hoses related to the engine cooling system. If you have a leak from the reservoir, the one hose runs to the upper radiator hose. It could be leaking at that point. See pic below.
Also, if you haven't already, I recommend pressure testing the cooling system. When the engine is cold, make sure the coolant is full, and then, using a pressure tester, pressurize the system. If there is a leak, you should be able to locate it when it is pressurized.
Here is a link showing how it's done:
https://www.2carpros.com/articles/radiator-pressure-test
I hope this helps. Let me know what you find or if you have other questions.
Take care,
Joe
See pics below.
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Saturday, September 23rd, 2023 AT 8:54 PM