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  #1  
Old 09-03-2009, 12:49 AM
RallyEclipse98 RallyEclipse98 is offline
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Question Loud noise coming from engine/overheating

The car is a 1996 Oldsmobile 98 with 282,000 original miles. A few months ago I heard a loud buzzing sound coming from near the engine. It sounds like a heavy fan spinning and hitting a metal shroud or something. It's pretty loud and makes a bunch of thuds really quickly. It doesn't happen very often. Just random times when I'm driving but always goes away after about a minute or so. It happens more when I have the A/C on I believe. Also, I don't know if this is related but the car overheats slightly when in traffic. The coolant is full with no leaks. Any ideas? I'm stumped. Water pump maybe? Thank you.
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Old 09-04-2009, 04:52 PM
maxwedge maxwedge is offline
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Re: Loud noise coming from engine/overheating

Remove the belt, if the noise goes away, spin the w/p see if it is noisey.
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Old 09-07-2009, 09:31 PM
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Re: Loud noise coming from engine/overheating

In addition, when the belt is removed, check the harmonic balancer for any back & forth play, by turning the outer hub by hand. This could also be the cooling fan motor! You need to check under the hood while the engine is running with A/C ON. Carefully, put your hand on the fan housing & feel for vibration.
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Old 09-09-2009, 04:10 PM
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Re: Loud noise coming from engine/overheating

I think it may be the fan clutch. The water pump pulley is tight and really all signs lead to the fan clutch. I'm going to put off fixing it for awhile because NAPA doesn't sell the fan clutch seperate and it's a $208 part w/ exchange.
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Old 09-10-2009, 07:25 PM
Jrs3800 Jrs3800 is offline
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Re: Loud noise coming from engine/overheating

Fan Clutch?
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Old 09-15-2009, 09:45 PM
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Re: Loud noise coming from engine/overheating

Quote:
Originally Posted by Jrs3800 View Post
Fan Clutch?
Google it. I had no idea what it was really before I did. I may be wrong but my research has lead me to believe it is the culprit.
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Old 09-16-2009, 09:19 AM
maxwedge maxwedge is offline
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Re: Loud noise coming from engine/overheating

No fan clutch as I know it on this fwd 3.8?
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Old 09-16-2009, 11:39 PM
Jrs3800 Jrs3800 is offline
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Re: Loud noise coming from engine/overheating

Are we talking about the fan its self?
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Old 09-17-2009, 07:35 PM
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Re: Loud noise coming from engine/overheating

No, I meant the fan clutch but apparently there's not really a stand alone fan clutch on the car so I would have to buy the whole assembly. That's what NAPA said anyone when I called for one. I still don't know what the cause is.
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Old 09-17-2009, 07:36 PM
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Re: Loud noise coming from engine/overheating

Quote:
Originally Posted by maxwedge View Post
No fan clutch as I know it on this fwd 3.8?
Yeah its a FWD 3.8. I wish I knew what was going on with it.
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