Coolant leak

Hello,

Did you try tightening the bolt? Sometimes a bolt, like the one in your picture (thank you by the way) will back off slightly, just enough to allow a minor leak, like the one in your picture. Try it and get back to us with what you are able to find out, please.

Thanks,
Alex
2CarPros.

I tried to tighten it and couldn't tighten it any more. Is there a copper washer or seal in/under there? Could that part be cracked? What is that called?

What is the name of that part where that bolt is?

Hello again,

I believe that is going to be your thermostat housing. There should be an O-Ring gasket in there that might have failed. I have included some diagrams for you in the diagrams down below. Please get back to us with what you are able to find out.

Thanks,
Alex
2CarPros