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GMC Sierra K1500 Making Noise

Q. Hey Vince, I have a question for you. I drive a 1990 GMC Sierra K1500 with a 5.7 liter V-8. It has about 123,000 miles on it. When I start it, I hear a fairly loud whirring noise inside the cab that sounds like it is coming from the engine. When you raise the hood, and listen for it, you can just faintly hear it.

GMC Sierra K1500 Making Noise

I bought it used from my neighbor about a year and a half ago. He said that the water pump and air conditioning compressor are originals and will probably need replacing one day. I've listened all over the motor and cannot detect where the sound is coming from.

It's funny how in the cab it can be heard easily though. From what I can tell, the noise doesn't seem to get louder, or a higher pitch or anything as I accelerate. I don't see how I need a new water pump, considering that when the truck is warmed up, the temperature doesn't get any hotter then 160°.

Also, the air works as cold as it did the day I bought it. I need to fix this, because I am going to be driving up north on vacation within the next two weeks, into the middle of nowhere, and don't need my truck to break down.

Thanks for your help, great site.

A. If the noise bothers you, it bothers me! First thing I would do is to remove the serpentine belt and sit inside to see if noise is still there. This would rule out all things being run by the belt if noise is still there.

Then crawl under truck and see if you can isolate it near transmission bell housing. Possibly a torque converter or front transmission pump? A short piece of garden hose can be used as a stethoscope to sniff around with your ears.

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