My car is 2000 C230K

About one month ago, the air conditioner of my car suddenly blow very hot wind when I was accelerating. I turned it off and after several minutes, it can make cooling again.
In recent days, this phenomena happens more and more frequent and even happens when I just drive several minutes.
When I turned off the cooling and let it blow wind, it also very hot.

Any suggestions would be very appreciated.

 

It could be your AC compressor. Check to make sure the diafram is not leaking.

 

Really? you mean it's not because of the electrocircuit malfunction? When the AC is on, it either make cooling as normal or blow hot wind. If the compressor has problem, should it just cann't make cooling? I have no experience about the AC, just confuse to it.
By the way, what is "diafram"? Thanks a lot!

 

Oops I ment Diaphragm. The compressor would be the first place I would look or maybe just have the freon level checked.