Just noticed that the air is only comin out of the defrost. I was wonderin what are some of the main causes for this. Could it be electrical problems or should i look towards more of a mechanical problem at the switch or both. its not a big deal just want to get it fixed

 

It is a vacuum problem. The vacuum hose to the air ducts is a very thin one going through the firewall just to the left of the heater hoses.