Just hot air?

Hello, you ignorant ones,
For 2 days now, my 93'iger 4.2er has been the problem that only hot air is blown into the interior. It is completely irrelevant whether I connect the climate compressor or not. Since I had to build on the car for days, I could of course somewhere vacuum hoses or electr.. I'm not sure I've broken the plugs. Can you please tell me exactly which component is responsible for warm/cold air supply and where exactly! ==References== ==References== We're sitting under pressure. PS. Pretend you're explaining it to a fool, because the heating and climate control system is the only thing that hasn't been broken off on my car and, as a result, I haven't yet disassembled it. (I have absolutely no plan of it).
Thank you very much.
MfG MartinBy the way, the Klimatronic is inside.