I can't ever tell what is going to happen when I unlock or lock my car doors. Sometimes one, two, three or all four doors will unlock and when locking the car the same thing happens. Is there anything to be done that can enable all the doors to lock/unlock simultaneousy? Help!

It's the "V" word Vacum. You have a leak, maybe the line or maybe the diaphram in the lock actuators. Plug off the line that goes to the fuel door first (in trunk @ "Y" branch) common leaking problem. Do you own a miti-vac? After that you will need to isolate each door (use golf tees to plug lines) to find where your leak is. There is volumes of "Lock Leak" information on the search feature.
SDL's hardly ever need repair so this is probably the only DIY job you will have to do on this car

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00 E420
98 E300 DT
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97 S500
97 E300D
86 Holden Jackaroo Turbo D
86 300SDL
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Your suggestions appear to be right on target. I have noticed that when I open the car all sorts of funny sounding noises can be heard in the trunk area that I never heard before. I thought they were coming from the antenna mast raising and lowering.

thanks,

Marvin Smith

That would be your vacum pump, it's somewhere on the right side.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Thanks for your input- I will try to locate it today.

Marvin Smith