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Hey Tony !!
welcome to the forum.
You are best asking these sort of questions in the technical forum. It sounds like your vac pump is shot. I think an electronic vac pump from just about any MB about the same age as yours will fit or can be made to fit. My brothers C280 has one in it out of an E class.
I dont think the aircon is related to the central locking on these. Best replace the vac pump & see what happens!
There are decond hand ones about if you go looking.
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Grumpy Old Diesel Owners Club group
I no longer question authority, I annoy authority. More effect, less effort....
1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles 
1987 250td 160k miles English import 
2001 jeep turbo diesel 130k miles 
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving
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