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Old 02-08-2006, 07:50 PM
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Join Date: Feb 2001
Location: Colleyville, TX
Posts: 233
98 S420 (W140) Whining

My 98 s420 whines at cold start. It sounds like a vacuum cleaner and stops after about 45 seconds. Also I am unable to reset my trip odometer. The owners manual says to push button 1 twice when key not in ignition or push it once with key in position 1 or 2. Neither works. Any ideas ???? Thanks

98 s420 - 50 k

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Old 02-08-2006, 08:13 PM
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Join Date: Dec 2002
Location: Southern New Hampshire
Posts: 418
The "vacuum cleaner" sound you hear sometimes at cold start up is the engine air pump. On your motor, the M119, its located on the passenger side of the engine just above the alternator. Its electrically driven by an internal motor.

1996 S500 W140 Coupe
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Old 02-08-2006, 08:21 PM
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Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160
You're kidding right?
" COLD starts " in Texas?
Come & visit me, you'll see what cold starts are like........pussy!
2007 C 230 Sport.
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Old 02-08-2006, 11:31 PM
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Join Date: Aug 2002
Location: Milwaukee, WI
Posts: 126
Yup, it's the air pump. Mine was very noisy, so I took it out last weekend to see if anything could be done. I could not get the fan pulled apart because the 13mm nut on the shaft would not let loose. I believe a bearing is worn and would like to replace it, but gave up and put it back together. Magically, it's much quieter now. It's on my '98 c230.
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Old 02-09-2006, 12:33 PM
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Join Date: Feb 2001
Location: Colleyville, TX
Posts: 233
Thanks Guys. I 'll take a look at it this weekend.

98 S420 50K

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