I have an 03 tdi and the ac was running perfectly fine one day and the next it just blows hot air. I did notice when I hit ac the compressor kicks on and does stay on the whole time but I get no cool air, the air actually feels pretty hot. I turn it to heat and I feel no change in temperature, just hot. I had the whole airbox out about a year ago to replace the evap core and I also repaired the blend door foam issue. I’m wondering if maybe one of the linkages to the door that controls heat/ac popped off so maybe it’s just stuck on heat? This car doesn’t have the electronic climate control either, it’s all ran by the wires. Haven’t had time to look at it yet but hopefully can get some insight as to what may be the issue, thanks.