AC (EC?) Problem
 

Hello

Just got my first car at the age of 17, a lovely C124 E220 1994. I got it pretty cheap, so i knew there would be a few problems, and luckily so far no big problems have occured. But, i got a weird problem with the AC or EC, i dont really know what the difference is, but the button says EC atleast.

In the middle where the place where the hot/cold air blows out in the cabin always blows cold, no matter what the degrees are at. The blowers near the doors on both sides blows whatever you set it to, but not the ones in the middle. If the blower is off, for some reason i can feel that its hot under the outtake, but when i start the blower it blows hot for a few seconds, then it blows cold again.
Sorry for bad english, its not my first language :)