i am getting a intermitent 12 volt signal to my a/c compressor on my 2003 s 430.the car was hit and the a/c condser,electric fan and drier have been replaced.it is a consistent on and off signal with the 12 volts coming and going approx every 5-10 seconds .also my electric condnsor fan is not coming on when the a/c is tuned on(should it?).the system was recently charged and checked for leaks.could this be a pressure switch prblem?if so how do you confirm bad pressure switch and where is it located.thanks