Hello really needing someone's help I thought I needed a new compressor for my air conditioner in my 07 Honda Accord v6 but turns out my compressor is working but it's not switching to my main front middle vents or pumping cold air like it's stuck on heat please help me so I can help my mechanic lol

 

Just to clarify, air is not switching vents (regardless of temperature) when you switch from defrost, to floor, to upper, etc? And the temperature doesn't change?

You can try the HVAC self diagnostic. See the common diy thread on top of the gen tech help forum. There is a how to on checking HVAC codes for your car.