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How about the noise that the central locking system vacuum pump makes? I realize that the pump is in the trunk but it's an idea. This pump runs for only a few seconds when it operates. Wires associated with its operation would be in close proximity to the window circuit wiring. Maybe an intermittant short between the the two circuits in the door somewhere. Check the locks and see what they are doing when the noise is present. They may be unlocked and the pump is trying to unlock them again for some reason. Locate the pump & check it when the problem happens.
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I got too many cars!! Insurance eats me alive. Dave
78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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