heater core problems

What is your question?

I purchased my spark new in 2013. recently (with less than 34,000 miles on it), my heater is pumping out cold air. Sounds like the heater core, but really, at 34,000 mikes?

What makes this problem better or worse?

it is sporadic right now, it will run warm for awhile, then turn cold. Today after making several stops, it was cold the entire time.

How long has your 2013 Chevrolet Spark had this problem?

A few weeks