just bought a 2010 A4 with 57,000 miles, AC is blowing hot if already pretty much turned the car upside down looking for the problem have spend the last 4 days working on it still cant find the problem, I gave up an hour ago want to get it diagnosed, but im not even too sure about doing that, i dont know if that will be worth the money they are going to charge because i have a feeling they are just going to make me spend money on things that dont need fixing need help, any ideas?

things ive checked:
continuity on wires from the AIR compressor, from temp/pressure sensor all the way back to the BCM1 or VCM

Changed the Pressure/temp sensor

Connected a/c directly to 12v and a/c blows cold

Checked r134 pressure

Checked all fuses

Checked air filter

other things I checked just dont remember

Please someone help out and this is the premium doesnt have dual A/C

 

I cannot figure out what you did here "Connected a/c directly to 12v and a/c blows cold" and how that is different than running it normally? I would think it is already connected to a 12v power source.

 

I mean I jumped it, got some wires and connected to ac compressor then ran those to the 12v source