thx Nige.. always interesting stuff to look at.. just for giggles I started looking for a part number for the pressure switch (high/low) in the AC system.. it's located at the HVAC box in the cab, just off floor level by the expansion valve.. it's not mentioned in the "not depicted" section of the box and I finally found it shown in the AC line pages but no indication of a part number.. I did a google search for various expansion valves in other cat mini's and looked through the numerical section of the parts book to no avail..