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You need to look at the wiring diagram and see the connection between idle control and the A/C. Then monitor that connection while the A/C is on. Then reproduce whatever signal is recieved. Probably only ground or battery voltage but it could be a 5v signal. That might be a little harder.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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