AC CHARGE/SCHRADER VALVE, HIGH SIDE. SEE #14 (RED ARROW), SWITCH MAY BE LOCATED ON THE RECEIVER DRIER ON SOME MODELS, OTHERWISE LOCATED ON THE HIGH PRESSURE AC HOSE (SORRY, NO ILLUSTRATION). FITS 1994-1996 XJS 4.0 & 6.0, 1995-1997 XJ6 XJR, 1994-1996 XJS, 1998-2003 XJ8 XJR & 1997-2006 XK8 XKR (MHD7372AA)