First post here. I have a 2009 Mazda3i 2.0 with 128,xxx miles. I have a coolant leak on the right side of the engine below the orange electrical connector. I have a coolant leak and i believe that its coming from between the block and the part i cant find a name for. I've asked different people for the proper name of it and got different answers. Car does NOT over heat. Its a moderate coolant leak. It is right below a frost/freeze plug if that helps. Any help would be greatly appreciated (other than being reminded that there is a screw missing.).

 

I can't see the leak but my vote is for the Coolant Temp Sensor based on your generic description. If its leaking from it, just remove it and re-install with teflon tape on the threads. If its leaking near it, then you might need to dig deeper in.

Good luck.
RGAZ

 

Have a look at this link, might be part #17 &/or #18

https://www.onlinemazdaparts.com/a/M...S/5417120.html

 

To properly confirm the exact location of the leak you need to pressure test the cooling system.

 

Thank you. Appreciate it