Thanks for the info, the Climate control pannel semms to be working great and to answer your question the EC light does work and the A/C does not turn on with the EC buttom on or off.

I performed another test, which It probably was not the way to troubleshoot the system but maybe someone has an idea of the actual problem:

Once I found out that the A/C system was fully charged but I was not able to turn it on with the control pannel, I proceded to cut the A/C compresor wire and applied 12 volts from an alternative source and the compresor, condenser fan, blower etc. worked great.

Someone mentioned to me that the voltage required for the compresor is only 2volts and the problem is the compresor clucht, is any truth to that statement?

Thanks again for your help