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  #1  
Old 10-27-2003, 10:11 PM
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W140 Ambient temperature bulb

Does anyone know the bulb type that illuminates the ambient temperature display in a 1993 W140? Iwould prefer to purchase the correct bulb before I pull the cluster. I seem to recall that this bulb is soldered to the board and not in a socket, but can't remember where I read this.
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  #2  
Old 10-27-2003, 10:15 PM
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No, they're soldered to the BASE (the part that twists into the board) but not to the board itself. Probably want to visit the dealer to get the bulb, usually they are an Osram 1.2 or 1.5 watt.
Hardest part is removing the cluster without cracking the lens, be sure to spray some soapy water around the perimeter of the cluster (trying to get it between the cluster and the dash) prior to trying to remove the cluster. NICE EASY PRESSURE, and also best done with a warm car, the vinyl of the dash will be more pliable.

Gilly
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Old 10-27-2003, 10:36 PM
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Thanks for the quick reply Gilly. Is the W140 cluster more difficult to remove than the W123? I use the hooks on the 123 and would assume that the same procedure would be used on the W140.
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1982 300D Turbo 198k
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1993 400SEL 123k
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  #4  
Old 10-27-2003, 11:02 PM
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Same basic procedure but BE WARNED that the 129 and 140 cars are just terrible for the tip of the removal tool slipping off the side and rather suddenly popping out and cracking the side of the clear lense. You have to be super careful NOT to let this happen. I'm not ashamed to admit I have broken a couple of them, shop had to pay for new lenses and they are NOT cheap.
Best advice I can give, first of all is the "heads up" that this CAN happen, so be cautious when doing the job, don't pull with wreckless abandon. The soapy water helps, so does making sure the interior of the car is warm. This will ease disassembly and make it unneccesary to use alot of pulling force. It helps if the cluster gets pulled maybe twice a year, it'll slip out easier. If the cluster has been in the hole for 1 or 2 + years, you're in for a struggle, but use extreme caution, it's about a $200 slip-up if you break it.

Gilly
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  #5  
Old 10-28-2003, 09:20 AM
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On the 1992-94 W140 chassis the ambient temp guage doesn't use a replaceable bulb unless the cluster has been replaced by a completely digital one. The temp guage must be removed & a suitable bulb must be soldered to the board.

You can tell if you cluster is digital by the type of ODOMETER that the car has. IF you have the older analog style then the odometer uses white rolling wheels that you can always read the mileage. The digital one must be powered-up to read the mileage.
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  #6  
Old 10-28-2003, 10:02 AM
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Thanks for pointing that out, I didn't realize it. Maybe the older style is more durable than the newer ones with the replaceable bulbs and I never caught the fact I was only replacing bulbs on the newer style clusters.

Gilly
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  #7  
Old 10-28-2003, 07:21 PM
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Thanks for the info. I will report back when I get this done later this week.

I do have the analog odometer so I will probably find the bulb soldered to the board.
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