I have a 2005 avaitor and the air and heat are both out. on 2005 Lincoln Aviator

I thought it might be the compressor but a machanic told me that it would only be the air that would go out with the compressor and not the heat... any advice on what it may be???

Asked by for the 2005 Lincoln Aviator
When you say they are both out , do you mean that the fan is not turning on?