The vacuum pump on my 1982 300sd produces about 20 inches of vacuum at idle measured at the pump. My locks don't function automatically and I've read that chasing down the problem is more of a nuisance than a technical challenge. What else does the vacumm system control / assist on this car? I've read that the vacuum system is even involved in the cliamte control. Are the various systems separate, so that a leak in the door lock system messes up the climate control too.