Occasionally while driving down the freeway my 1991 S-10 blazer makes a noise that sounds like a train whistle coming from the engine. It gets louder as it goes and will only stop if the car is brought to a complete stop. This doesn't happen every time I drive it, but it happens often enough to be annoying!
Recently, when braking at stoplights there is a pitter-patter noise when the vehicle is braked at a complete stop. My friends said it "sounded like a helicopter."
I would really appreciate any ideas as to what would cause this!
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What I would do is look around the edges of the windshield where the molding trim runs along for an open gap. The molding trim should be flat against the windshield as possible. A open gap would cause a whistle type of noise during high speeds. An automotive supply store should carry a glue for hold the trim piece back down on to the windshield.
I don't know how loud the noise is, but its weird that you mention 50 mph. At that speed or above you are keep a constant rpm level. I say this because it might just be your air box loose and the sound of the intake air is making it. A 2008 truck should not have any major problem. Sometimes an alternator will sing or whine but never heard anyone say something is whistling. One other thing is sometimes for some reason ive heard a noise like that coming from the speakers of my car that goes up and down with the speed of the motor, but that was when I was tinkering with speakers and sub outs and amps. Thats all I can think of.
This either means your battery has failed or the alternator. You can use a voltmeter to monitor battery voltage it should maintain at least around 13 with lights on if it gets low and car eventually stalls replace alternator. Thanks
Check your driveshaft universal joint (u joint). When the needle bearings go, this is the sound it makes. To check, chock all wheels front and rear, put in neutral, if 4x4, put 4x4 in neutral also, go under vehicle, grab driveshaft at u joint and try to turn back and forth, watching for play, wobble in u joint. U should be able to see it. Let me know how u do.