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Old 02-01-2002, 01:10 PM
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Thumbs down sluggish door locks

My 1977 450sl seems to lock o.k at times, other times the right door lock is inop completely. I removed the door panel and lubed all the control rods. it seems to work now but the lock is sluggish and doesn't look like the inside door button closes all the way. Any suggestions?

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Old 02-13-2002, 04:15 PM
BWatson's Avatar
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Join Date: Jan 2002
Location: Los Angeles
Posts: 222

I bet it's probably the vacuum cylinder. When they get old, the leak intermittently for awhile before they go completely. Not an expensive item but you will have to take off the door panel again. It's either that or some other vacuum leak.
1982 300D Turbo "Helga"
380,000 miles
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Old 05-29-2002, 12:26 PM
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Join Date: May 2002
Location: westchester ny
Posts: 94
hi, i have the same problem w/ my 77 sl, if i open and close the drivers lock many times, then the others work, if i just do it once, the passenger door, fuel flap and trunk do not open and close, did you ever fix your problem and if so, what was it, thanx in advance, Andrew

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