Ok so the holes are not freeze plugs. There is a pipe that runs between the heads and the coolant temperature sensor is located in that pipe. This "pipe" is not there anymore. My guess the mechanic broke it trying to remove it. Mazda says it's "non-serviceable". They replace the whole head...
I had a shade tree mechanic start to replace my head gaskets. He tore the engine down, then sent me a text telling where I could find my car. (With all remaining parts in the trunk) . So I got my car and had another mechanic friend help get the heads and intake on. Now I find that the driver...