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Multi-Diag Access J2534 has the function for air condition, such as Diagnosis of cooling electronic, Reading settings cooling circuit,Test servo actuators
There is a pressure sensor welded into the pipe work for the aircon with two wires coming out of it.
Unplug this and bridge the wires together when the car is running with the air con on.
If it is a faulty pressure switch you will hear the clutch on the compressor cut in and out when you touch the wires together..If this works buy a new switch..but you will have to have the car regassed.
Cheers
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