Auto Air Conditioning & Heater Repair: 1999 chevy tohoe, air doors, elisha

Question
I tried to run my heat and it will only come out of the defrost and it is only blowing cold!!! I need this fix fast the winter is here and I have been freezing! Can you please help?

Answer
Hi Elisha

You need to have it checked out and let me know something if not there is no way of knowing where to start. Is the compressor staying on when you disconnect it, are the air doors moving when you command them to.  Too many things to check before i can help you.