the condenser fan at front(coil at rad is for ac) is going on and off because of pressure switch, could be short of gas(refrigerant) usual cause of cycling, check that compressor is going on and off the same cycle as the front fan and this is almost defo the prob,, needs a re-charge, good idea to try and leak find as well to cure prob, get ac/refrigeration eng'r to look at it as a homer, I do them all the time