Even though air pumps and vacuum pumps pump air, they are not the same thing. A.I.R. pumps actually stood for air injection reaction and are emissions devices and in all the belt driven models necessary to carry the belt (mainly). On newer versions and Ca. versions the check engine light is lit during pumping faults.

The clutch can be purchased from MB and can save some money, but the pump internals are not generally available. I have only heard of rebuilders doing this task internally.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician