Jim My Bonneville AC was cycling rapidly and there was the proper amount of R-134. It turned out to be the AC Cycling Pressure Switch that is mounted to the Drier/Accumulator. About $14 at the parts house. It just screws on, there is a Schrader valve behind it to prevent the loss of Refrigerant. Scott Mueller DMCNEWS 002981 DOA 5031 -----Original Message----- From: ultra@xxxx [mailto:ultra@xxxx] Sent: Sunday, July 01, 2001 12:45 AM To: dmcnews@xxxxxxxxxxxxxxx Subject: [DML] AC Problems While driving around today, enjoying nearly 400 peacefull miles of country cruising in the D, I encountered 2 different problems with the AC system, although it still seemed to work. First problem, the AC compressor would turn on and off VERY fast, (up to several times a second.) It started only doing this intermitently, but now it seems to do it constantly at anything above an idle (and sometimes, even idle). I dont know any service history on my AC system, and I am guessing it is low on freon. Any other possibilities?