Are talking about the diaphragms?? If this is what you are after they are on the fire wall side of the heater box ( yes yippy!!!!) which means splitting the accumulator box and heater box at the fire wall. Then to make it better, the WB Stato has three diaphragms, two different size diaphragm( one large one,same size as the other models which which only have two diaphragms and two smaller ones and these smaller diaphragms are hard to get unless you know somebody who is wrecking a Statesman and is prepared to separate the A/C and sell it in bits. I think I may have some notes some where as to where the hoses go onto the actual controls if this helps as theses are colour coded but I am sure they are also listed in the manual. I have had my dash disassembled for nine years and dreading the day I have to assemble it. Cheers MS

Have requested your E-mail I can help you.

A bit unsure if you are after information for a WB A/C or the HX type but if you have the holden workshop manuals volume 5 electrical and A/C page 61 of the A/C section may be of help. it is a colour coded vacuum line and electrical schematic. The HQ A/C looks similar to the later models with only two diaphragms.