leaking heater core?

Took the blazer for a ride today and noticed a small leak (anti freeze) inside on the passenger side floorboard, does this sound like a heater core?
Are they hard to replace?

I'm sure they are coverd in the TM's in detail.
thanks

there really ez to replace. if it takes you longer then 30 min you have a problem.

yup its the heater core, do it sooner than later. Otherwise one day your gonna get a bunch on your floor. Its the same as the civilian truck, so if needed a haynes or chilton manual can be used. I would have to look but the procedure should be in the -24 (unit maint.)

Easy with no A/C.