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Item 3 is probably the only sure bet. Because it could also effect 1 and 2 I'll give my opinion on it first.
The pushbutton control is most likely thye cause of item #3 and could easily be the problem in #1 also. Too large of an airgap on the compressor clutch is another answer to #1.
On #2, yes this is vacuum controlled and the relationship between freeway and idle says that either the supply is weak or the leaks in the system are small enough that a huge source overcomes them.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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