My 2010 h3 is leaking anti freeze inside on the passenger side also big puddle by passenger side outside. I think its the heater core but not really sure. Is the heater core easy to replace? Does anybody have video on replacing heater core?

 

I5 or V8?

If the heater core was leaking, you would have a strong smell of coolant inside the truck. Smell anything?

To best check it out you will likely have to drop the skids, take it to a spray wash and clean it all off under there, then look to see where it is coming from.

Good luck.

 

very strong smell of coolent inside