607 Air Con problem

crazy fool

Member
Tadpole
Joined
Sep 12, 2014
Messages
30
Location
sydney
Vehicle is 2003 3ltr V6 607. Air Con Clutch wont engage. Only 8.5 Volts supplies the clutch. When 12 volts is applied clutch engages. With ambient temp of 26C and humidity of 78% low side static pressure reads 570Kpa when vehicle stood overnight which tells me refridgerent level Ok and should operate pressure switch. That being the case I would expected to see a voltage reading of either 12 or Zero not 8.5 at compressor connection. Pressure switch is 3 wire type which I cannot get access too. Can anyone point me to a possible cause of the 3.5 voltage drop such as location of any connectors and voltage sources. Apparently these vehicles have a pressure switch problem but will a faulty pressure switch result in my problem. I cannot believe this as if it failed in service it would result in burning out the clutch faces but t5hen again I dont know how this switch operates
Any ideas ?
 
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