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Electric motor noise from dash?
Hello there,
I've just started taking Boxy (1982 300SD) out for spins around town, and I noticed when I sit stopped at stoplights that there is a noise coming from the dash. The best way I can describe it is an electric motor or servo noise. It is faint, I can only notice it when climate control is all off, and I don't have a radio right now so no other noise. It sounds like it goes on and off, or perhaps back and forth? I have no idea what it could possibly be. Without the climate control on there shouldn't be any activity back there, and I can't think of any systems that could produce that sort of noise, except maybe the cooling system (the w116 "evil servo" comes to mind). I don't hear it when I open the hood, but then again I've got a nailing injector making a racket Does anyone know what it is? Should I be concerned?
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
#2
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There is a small motor that draws air cabin air across a temperature sensor. The motor is under the glovebox, but I think it turns off if the O button is pressed on your climate control unit.
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Michael LaFleur '05 E320 CDI - 86,000 miles '86 300SDL - 360,000 miles '85 300SD - 150,000 miles (sold) '89 190D - 120,000 miles (sold) '85 300SD - 317,000 miles (sold) '98 ML320 - 270,000 miles (sold) '75 300D - 170,000 miles (sold) '83 Harley Davidson FLTC (Broken again) :-( '61 Plymouth Valiant - 60k mikes 2004 Papillon (Oliver) 2005 Tzitzu (Griffon) 2009 Welsh Corgi (Buba) |
#3
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I get that same sort of thing in my 123, it sounds like it comes from behind the climate control unit.
Nothing will be on, no radio, heat/air, lights etc... it sounds like a buzzing sound. it comes and goes and can be a little louder at times. when we stop, so does the sound. also it doesn`t do it all the time. I even swaped the CC units thinking it being the cause somehow. sounds like maybe a relay. Be interested to get to the answer to this. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
#4
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It sounds like a servo or electric valve opening and closing. My climate control is off, the big O button is depressed.
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
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