If you can, have the system pressurized. Either you do it or a shop. I've been losing coolant ever since I had my water pump replaced. I feared castech heads. Fortunately when I had a shop pressurize the system it was leaking from the pump and I'd have never known since it dripped onto the engine and burned off. I'll do another pump/gasket myself. So glad my heads aren't cracked.
I think this is my issue as well, because I went through 2 new water pumps (remanufactured) before one sealed well enough not to leak it out in a giant misty cloud of dexcool as I drove around.
This one didn’t leak a drop until after the wreck, which broke the original reservoir, and it’s leaked from somewhere since they “fixed” it.
I also worry I could have a leak at the head, but if I do, it’s insignificant enough not to show in the oil so far. Engine swap is in the future for the old girl either way, so for now just gonna keep on keeping on.
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