Whats that niose? engine compartment

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Apr 12, 2012 | 10:37 AM

superdave269

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Whats that niose? engine compartment

Hi Everyone, I'm new to the forum and to my 1992 C4. I've played with Gen1 engine for yrs. Built many SBC but this car has a lot of stuff under the hood(not just HP). I have 2 nioses that I wanted your opinion on. These are not engine nioses, not knocks or taps but a niose that I think may be the bearing in the alternator. The other one sounds like a vacuum cleaner, but is not always there just hear it sometimes. Do you think it is the fan? I am not panicing but figured why not ask the C4 guys. I am guessing that these nioses may be common. Thanks

Apr 12, 2012 | 10:41 AM

cv67

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From: altered state

St. Jude Donor '05

Probably your air pump coming on making noise thats normal.

Apr 12, 2012 | 10:44 AM

superdave269

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Thanks. Some of my cars are so old they don't even have them.. My 1969 El Camino is a totally different car than this vette.

Apr 12, 2012 | 10:46 AM

1986coupe

Burning Brakes

Joined: Jun 2003

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From: Niagara Falls ON

Fans coming on will make a vacuum cleaner like noise.

Apr 12, 2012 | 12:04 PM

superdave269

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Thanks, My other cars are so old they do not have an electric fan. Funny that the car is 21 yrs old but it's a new car to me..

Apr 15, 2012 | 02:54 PM

RACER 1993

Racer

Joined: Sep 2007

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From: Bartonville Illinois

There is a blower on a 93 thats mounted below the drivers side headlight. Its supposed to run for a few seconds at a time. Its about the size of a round headlight and is mostly black plastic.

Apr 15, 2012 | 04:54 PM

John A. Marker

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Joined: Mar 2004

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From: Dublin CA

Take a long screw driver and place the metal end on the top of the alternator and then place the plastic end at your ear. You can use this like a stethoscope ....listen for bearing noise.

Check your air filter cover. If the prior owner cut the cover out, this will have a tendency to give you that vacuum noise. The radiator fan is usually a different noise......like a fan

Apr 15, 2012 | 05:31 PM

superdave269

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Thanks!! It does sound like it coming from driver's side head light. Good Idea with the screwdriver too. I love this forum. People here want to help!! I started posting on another forum and got attacked and told my car was worthless.. So happy to find you guys. Thanks again.
PS now if I can get some help with my broken door lock, please...