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Old 02-18-2008, 01:14 PM
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Location: Red Boiling Springs Tennessee
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What could this sound be?


For the last few cold days (below 39F) I have noticed a fan like sound coming from my right front dash vent. I tried the heater motor at different speeds, but the sound remains constant. As she starts to warm up the sound flutters a little, then completely goes away. Does this mean a repair down the road? Thanks for reading this.

Hugh, Sr.
1984 190d 2.2 (waiting on insurance company to fix left front fender - Allied Van Line truck didn't swing out far enough when he made the turn toward Carthage, Tennessee)
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Old 02-18-2008, 01:15 PM
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Could that be noise from the fan clutch? {does a 190 even have a cooling fan/viscous clutch?}
Jimmy L.
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Old 02-18-2008, 01:36 PM
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Location: Old Lyme, Connecticut
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By fan noise do you mean rushing air or a motor running? Is it a new noise, or is it something that started when the outside temperatures got lower?

You may have some vacuum operated gizmos connected to the vent line and one of the actuators may be hissing until the engine temperature rises enough to change the climate control system command to that flapper. In my 1998 E300D TurboDiesel I get a number of such noises as things reposition themselves while I wait for the glow light to go off on a cold morning.

Not sure I would get too worried about it, yet. Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
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1971 220D (250,000 miles plus, sold to father-in-law),
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Old 02-18-2008, 02:15 PM
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sounds exactly like a bad aspirator motor, this is the little fan that intakes air for the in car temp sensor, i have seen a few go bad and do what you describe.
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Old 02-18-2008, 10:04 PM
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Originally Posted by JimmyL View Post
Could that be noise from the fan clutch? {does a 190 even have a cooling fan/viscous clutch?}
The 2.2 has an electromagnetic clutch like an A/C compressor.
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Old 02-18-2008, 10:14 PM
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Join Date: Dec 2005
Location: Ashland, MA
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I'm not sure if your car has the cabin air temp sampler, that sends the heat to the porcupine, to adjust the fan speed, like the 124 does. If it does, that could be making noise. It is located under the passenger side dash in the 124. Mine will make noise when it is really cold. I did lube it with some ATF (as GSXR suggested) that seemed to help.

Does that make sense? Same thing Carson suggest hours ago.
1987 300TD 309, xxx 2.8.2014 10,000 mile OCI

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