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Old 05-30-2019, 01:13 PM
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Join Date: Aug 2005
Location: Sunny Ft. Lauderdale
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w124 cabriolet owners

Dear all,
My 94 cabriolet has a rattle in the upper windshield frame, center section essentially above the dome/map light assembly. To my ear it sounds like metal rods possibly connected to the soft top latch assemblies that may have un clipped from their isolators making the rattling. So far the soft top latches work as they should, but the rattle is driving me batty. Also, the locks, handles and visible latch hardware is tighly mounted, and the noise originates from inside the a pillar head rail.

Has anyone experienced the same and have any insight as to the possible causes, that they can share?
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1994 E320 Cabriolet 90K mi (Kloud)
1987 300TD 299K mi Intercooler (Hans)
1975 Corvette 4-speed 59k mi (Hot Lips)
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Old 05-30-2019, 03:21 PM
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Are you sure that itís not the mirror door in the visors? Those will make quite a rattle when the Hinge breaks
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Old 05-30-2019, 03:50 PM
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Speednjay,
Good suggestion, unfortunately FL sun and open top highway driving had long ago cause my vanity flaps to fly away on some lonely stretch of highway, somewhere.

The rattle is noticeable only when going over bumps and comes from the area between the latch handles in the headrail. The parts diagrams dont
Indicate any parts between them as the handles are self contained independent units, so I'm miffed at what it could be. It is definitely metalic, and of some substance.

Does anyone know if there is a rollover sensor switch there? How about a harmonic balancer? Sounds like an odd place, but I have seen them used before in convertibles.

Would like to get some opinions before having to explore around a lot of brittle plastic trim.

TIA
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Stable Mates:
1994 E320 Cabriolet 90K mi (Kloud)
1987 300TD 299K mi Intercooler (Hans)
1975 Corvette 4-speed 59k mi (Hot Lips)
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Old 05-31-2019, 03:03 PM
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solved, vibration damper

Okay, after some research, and by pure chance watching an MB Technical overview on you tube on the w124 cabriolet last night, I found out that tha cabriolets have 3 vibration dampers installed, the big one on the left front shock tower, one in the left trunk well and lastly the third is in the center windshield headrail.

To access the damper in the headrail, do the following:
1. Remove dome light surround by yanking off rear view mirror, prise out the map light lenses from the rear face to uncover 2 mounting screws. Remove the 2 aforementioned console mounting screws, as well as 3 screws holding the metal rear view mirror mounting base. Let the console hang on the power wires. Look up in the center of the exposed headrail metal and you will see a black metal spring clip, more on that later

2. Losen the 2 visor clips, no need to remove, just loosen 1/4 inch to relieve pressure

3. Remove to 2 roof latch plastic trim surrounds on the top of the headrail, the receiver end where the top clasps into. To remove these, fully remove mounting screw and then pull laterally towards the outside side of vehicle, there are small "L" tabs on the underside that can snap if not careful and pull out to the side.

4. Peel back exterior APillar rubber weatherstripping at the top of the A pillar by the headrail top vinyl cover, this will expose 1 screw on each end that secures the headrail top cover. Remove these carefully with a magnetic screwdriver to ensure it doesn't fail into the pillar.

5. Carefully prise the top headrail cover upwards from each side, carefully working it out of the rubber front window seal as well as rear plastic trim around the top latch handles. Once you near the center of the headrail you will then need to prise that exposed metal spring clip uncovered under the dome light console. Once the spring clip is freed, the headrail cover lifts freely.

6. With the headrail cover exposed you will see a lead bar about 10 inches wide mounted in a channel in the headrail. It weighs about 5 pounds. Tye bar is mounted in rubber isolators on each end. While mine were intact, they were also drooping a bit. I suspect that with a harsh shake such as going over rail road tracks, the vibration is too much for the aged mounts causing the damper assembly to contact the surrounding area and thus my rattle.

I chose to add foam tape weatherstripping, the home window and door stuff about 1/4 inch thick to the length of the lead bar on the bottom and beveled sides to isolate the bar from the headrail in a drastic scuttle shake.
You could renew the rubber mounts if they are still available, but if they are intact no real need to replace.

Whatever method yoh choose to use, do not affix the damper rigidly to the headrail or you negate the purpose of the damper, it must be free to flex within its mountsin order to work.

Installation is reverse of removal starting with the center spring clip first, and then working the cover carefully back over the trim and into the windshield seal.

While the cover is off, look at and lube the top latch assemblies, which incidentally come out this way as well, should theh need servicing, with the headrail cover off, they are fully accessible.

If anyone can suggest a good free image hosting site, please let me know, as photobucket is no longer available to me for this purpose.

Thanks
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Stable Mates:
1994 E320 Cabriolet 90K mi (Kloud)
1987 300TD 299K mi Intercooler (Hans)
1975 Corvette 4-speed 59k mi (Hot Lips)
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