[Gravter]

Well, I'm not sure if it's really it, but I think my heater core is leaking!
My windows fog up on the inside but I can't really smell anything. I don't see any leaks in the cabin either. Anything else I should check?
How hard or EASY is it to change the heater core? I'm hoping it won't require me to take it to the shop. I've changed one in my old '83 Mustang years ago.

Thanks for your help!