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Roaring fan 200 1982

posted by  someone claiming to be ckugel on  Tue May 31 04:52 CST 2005 [RELATED]

Brickers-

I would like to hear why my belt driven thermostatically controlled cooling fan roars loudly during the first half mile or less after cold start. The clutch resistance is higher cold than when shut down after a hard drive. Yet it quiets up soon after 1/2 mile or so and does roar again if things get hot idling in traffic. I never hear anyone elses brick make as much head-turning noise as my 82DL does leaving the complex in the morning.

Thanks Craig.








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    Roaring fan 200 1982

    posted by  someone claiming to be ckugel on  Wed Jun 1 08:43 CST 2005 [RELATED]

    Okay...

    You've all given me the service manager's shrug and effectively said "they all do that". And if this is so, the cold clutch must have some purpose which escapes me in explaining the "why" in my question.

    Maybe mine is a bit worse than others. I am grateful for the responses. Anyone have a clue how the clutch works to describe this ditch-shaped temperature response curve? How does the bimetal sensor work with or against the fluid coupling?

    Thanks Craig.








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    Roaring fan 200 1982

    posted by  Volvodad on  Wed Jun 1 07:16 CST 2005
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    last visit: Thu Oct 23 16:18 CST 2014
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    It's part of the charisma of 240's! Both ours do that, but the fan roar usually abates by the time you catch second or third gear.
    --
    Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar 77 MGB, and a few old motorcycles)








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    Roaring fan 200 1982

    posted by  Rludwick on  Tue May 31 15:41 CST 2005
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    last visit: Sat Aug 31 16:10 CST 2013
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    IT's normal, see the Faq's : http://www.brickboard.com/FAQ/700-900/Cooling.htm#Thermostatic_Fluid_Clutch_Test
    --
    -------Robert, '93 940t, '90 240 wagon, '84 240 diesel (she's sick) , '80 245 diesel, '86 740 GLE turbo diesel, '82 Mercedes 300SD for sale








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    Roaring fan 200 1982

    posted by  gms on  Tue May 31 05:48 CST 2005
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    last visit: Wed Sep 11 18:35 CST 2013
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    My 82DL does the same. I use it to frighten animals and small children out of my way when I'm driving off in the morning! :)

    I think the viscous oil in there is locked up cold, then as it warms up slightly it unlocks, then locks again at high heat. My old pickup does the same, except it's swinging a much larger 5 blade fan and is even louder.







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