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Old 12-28-2003, 06:01 PM
GottaDiesel's Avatar
Join Date: Sep 2003
Location: New Jersey
Posts: 1,564
Sounds like a fan that is reving high/low/high/low.

I just notice something interesting -- not sure if it was there all along...? When I first start my car and it is cold -- it sounds as if the fan is reving fast/slow/fast/slow... very odd, but you can definityly tell the difference. This isn't the aux fan either...

Anyone know what this is? Normal?

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Old 12-29-2003, 12:02 PM
Registered User
Join Date: May 2002
Location: Central Oregon
Posts: 1,004
I don't see the year but....

Could it be the fan clutch is starting to go out?
Engaging and then disengaging? Might watch the fan speed (a strobe would be great) while it is running at a constant speed.

I'm guessing as you can tell...
'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique
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Old 12-29-2003, 12:07 PM
GottaDiesel's Avatar
Join Date: Sep 2003
Location: New Jersey
Posts: 1,564
Hmmmm... fan clutch... I have to do some reading on this... it only happens when the engine is first started...

I'll do a search and see what I find. I added the info about the car to my signiature... hope this gives you more info.
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