In my new-to-me '95 Golf III GL (has '96 styling... sold in Canada), the automatic door locks are somewhat unreliable. All of the locks are supposed to lock/unlock together when you (un)lock one of the front doors (it's a four-door). Instead, some of them go and some of them don't. Simultaneously, I hear a loud pumping noise from what I assume is a pneumatic pump located on the right side in the rear, right next to the hatch.
I haven't gotten ahold of the Bentley manual for this car yet, so I'm not quite sure how to diagnose it. I assume that either that pump is bad, or there is a leak in some pneumatic tubing. Any ideas of common failures? I have another '96 Golf from which I can canibalize anything I want.
thanks, Tobin