High Pitch whistle
Thread Starter
Burning Brakes
Joined: Aug 2001
Posts: 1,160
Likes: 3
From: Greensboro NC
High Pitch whistle
Every time I rev the car above 3500 RPM I get a high pitch whistle or screaching sound from the water pump area. What it isnt : belt noise, tightened and treated with belt dressing. Could be water pump? clutch in fan? Only at 3500 and above. Almost like a built in rev limiter cause it sounds like finger nails on a chalk board. Open to suggestions that wont cost anoyther 500 bucks. :confused:
Melting Slicks
Joined: Aug 2000
Posts: 2,310
Likes: 1
Re: High Pitch whistle (micks69)
Well, I guess I can't help you. I noticed mine just started doing that the other day and I assumed that it was the belt. I haven't tightened it up yet to see if it goes away though. I guess I'll be watching this post for tips. Good Luck.
Former Vendor
Joined: Apr 1999
Posts: 7,607
Likes: 1
From: ECS Sales & Service Advisor
Cruise-In III Veteran
Cruise-In V Veteran
Re: High Pitch whistle (Sleper)
Could Be a couple of things... The Belt is the easiest, so check it first. Also it Could be a vaccum leak, your water pump going bad (the screec will seem to come from right under thew pulley area) or, if you have my car a bad bearing in the alternator. Which makes me :mad since the alt is still pretty new~~! (it's only about 4 months old!!!)
Happy hunting! :mad
Happy hunting! :mad
Melting Slicks
Joined: Jul 1999
Posts: 3,201
Likes: 0
From: Clifton Park NY
Re: High Pitch whistle (micks69)
My car is a whistler too, and now that you guys have mentioned, I believe the problem is the alternator bearing. What is the PITA factor of replacing the bearing?
-Pedro
-Pedro
Melting Slicks
Joined: Jun 2001
Posts: 2,414
Likes: 1
From: Forest Hill Md
Re: High Pitch whistle (micks69)
My guess....Fan clutch. I had the same thing you describe. Took it to my friends shop to have things looked at, I was thinking water pump but when he checked the fan clutch some of the bearings had come out. Squeeled off and on but not at idle. He replaced the clutch and the sound is gone. Relatively cheap fix for me.
Good luck.
Good luck.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Burning Brakes
Joined: Aug 2001
Posts: 1,160
Likes: 3
From: Greensboro NC
Re: High Pitch whistle (Dwaynes69BB)
Dwayne your ride is looks really tight too! Soon mine will have all new and rebuilt parts as well. Got her done all the way to the rear end. Rear susp will have to wait till next winter.
Drifting
Joined: Aug 1999
Posts: 1,468
Likes: 1
From: Kirkland WA
Re: High Pitch whistle (micks69)
Double check your front mounting brackets; alternator, fan, etc. I had the EXACT same squeal -- didn't think it was the belt, but it turns out that the hold-down bracket was a little loose, and the bottom of the (dunno what you call it) alternator "guide" bracket was also loose. So, at really high speeds the alternator would shimmy a bit and cause the belt to squeal.
Anyway, hope that helps!
Anyway, hope that helps!
Thread Starter
Burning Brakes
Joined: Aug 2001
Posts: 1,160
Likes: 3
From: Greensboro NC
Re: High Pitch whistle (Pedro'74)
Been my cheapest fix yet! Felt good to go into the parts store where they know me on a first name basis and say "that be all todayl" key word today! :D
Burning Brakes
Joined: May 1999
Posts: 1,179
Likes: 0
From: waller texas
Cruise-In I Veteran
Re: High Pitch whistle (micks69)
FIRST GRAB HOLD OF THE FAN AND SEE IF HAS ANY MOVEMENT SIDE TO SIDE OR TOP TO BOTTOM.IF NO MOVEMENT THEN SEAL AND BEARINGS OK MORE THAN LIKELY ON PUMP.ONE WAY TO NARROW IT DOWN IS DICONNECT THE BELT FROM ALTERNATOR AND SEE IF NOISE GOES AWAY.IF IT DOES THEN MORE THAN LIKE LIKELY IT IS THE ALTERNATOR.NOTE: IT IS NOT GOOD IDEA TO USE BELT DRESSING AS IT CAN DESTROY GASKETS AND CAUSE LEAKING.ALSO CHECK YOUR HARMONIC BALANCER TO SEE IF IT IS LOOSE AND RUBBING SOMETHING CAUSEING THE NOISE.ALOT OF TIMES A HIGH PITCHED NOISE IT A VACUUM LEAK ALSO.TAKE WD40 AND SPRAY IT AROUND CARB.IF ENGINE SPEEDS UP THE YOU HAVE FOUND A VACUUM LEAK. WAVE ON ! \ ////