Aircon
 

Recently after not working for 7 years I decided to get the airconditioning(on a w124) unit working. The reason it was not used for so long is becuase it use to cut out after ten min then never come on again, until engine restart. I was told the sensor that measures engine speed and compressor speed need to be exact, if not the compressor goes into protection mode until restart.
So now I just got the thing re gassed and it works, still cuts off occasionally but the worst problem its not too cold. How could I improve its refrigeration?

Just replaced the Kilma relay with another and this seems to have stopped the compressor from cutting out but its still not very cold

You didn't give details of the a/c recharge/repair. It seems you're at a point where you need to read the pressures (high side and low side) as first order of diagnostics.