It sounds like it is either coming from the water pump or the feed pipe between the pump and the thermostat.
Are you able to check the front of the engine with a small mechanics mirror to see if you can locate the leak? Normally, I would recommend pressure testing, but if it runs out, pressure will likely not work.
Is it possible for you to get a helper to watch for the leak location while you add coolant? I'm not sure what you are comfortable doing. However, if it runs out when you add coolant, the leak should be visible.
Joe
Wednesday, October 26th, 2022 AT 5:35 PM