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91 trooper mystery noise (video)

Sat Oct 17, 2020 6:09 am

I recently began hearing a new noise under my hood. Kinda sounds like the truck is howling. lol

explained - you-on-tv.com/trooper-noise.mp4

Noise - you-on-tv.com/trooper-noise1.mp4

Suggestions appreciated?

Re: 91 trooper mystery noise (video)

Sat Oct 17, 2020 7:38 am

mlgsr wrote:I recently began hearing a new noise under my hood. Kinda sounds like the truck is howling. lol

explained - you-on-tv.com/trooper-noise.mp4

Noise - you-on-tv.com/trooper-noise1.mp4

Suggestions appreciated?


Links didn't work for me. But the word howling, in my mind might be fan noise, like the fan clutch isn't working correctly. So maybe just remove the belt and try it again to see if the noise is still there.

Re: 91 trooper mystery noise (video)

Sat Oct 17, 2020 10:50 am

Links worked for me. Honestly it sounds like a bearing growling, not an engine bearing, but one of the accessories driven by the fan belt.
Any chance you can disconnect the fan belts and drive it a short ways to see if it goes away?
It sounds just like a loose bearing vibrating and may also be dried out. In the past, I have had troubles with all sorts of various bearings, the GM AC compressor seems to have problems, but could be any other one too..alternator, idler.

Re: 91 trooper mystery noise (video)

Sat Oct 17, 2020 3:42 pm

Thanks for the replies..

Sorry about the links, but it should work if you copy and paste them into your browser.

I have installed a new a/c compressor and the idler pully in the last few months. I also removed the Air Compressor and changed the belt. I wasn't able to replace the tensioner because the center bolt is stripped. So, there is some belt squeel when I have the ac on sometimes.

I will keep trying to pinpoint it and post more when I can.
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