Recently, the mechanic replaced the evap fan, had the unit recharge with freon, ..but after a week, the a/c did'nt work anymore. It seems that the comp does not activate when the normal switch is pushed. Do I have any problem with the climate control knob ? Where is the relay that activate this unit ?Also, ..I notice that the clock does not perform correctly, ..most of the time, ..it's fast. Please provide some tech advice.