The a/c works. But I can't get heater to work.

What is your question?

I can't get the heater to work. The a/c works good. The temperature only goes to 63. How can I get heat

What makes this problem better or worse?

The a/c works fine. It's just no heat.

How long has your 2004 GMC Envoy XL had this problem?

Just got Envoy few months ago