I have a 1983 Delorean which has a wooshing sound...maybe a vaccuum leak in the A/C control area....and I am not sure the cooling and heating control system is working properly. I want to replace the A/C mode Switch Diapharm as a first step in correcting the situation. I would appreciate some guidance on the proper disassembly sequence fo replacing the diapharm...and any other suggestions. This car was setting for many years and the A/C does not work...has anyone successfully undertaken (long term operation with no componet failures) a refridgerant replacement to R134? If so, what did you do? Mike