strange noise

AdamsDenali · April 15, 2004

i just started hearing a high pitch screeching sound, almost sounds like a brake pads rubbing, but it's not. It's hard to locate, but it sounds like it's coming from the bottom of the engine, behind the drivers side front wheel well. Anyone have any ideas?

TROYROBO · April 15, 2004

might be a cat you ran over

Wingnut · April 15, 2004

OK, let's start with when does it happen?

Does it get worse when you turn the wheel?

Could be belt slipping, or power steering pump.

It's hard to tell without more details.

sjspor · April 15, 2004

I think that was my cat...

When do you hear the screech? Truck cold or hot, when u hit the gas, braking?? One thing to try is go thru a quiet overpass with the windows open, that may help, or have a buddy stand by as you drive past.

AdamsDenali · April 15, 2004

it just started last night after I filled my tank, I pulled out of the gas station kinda hard while making a right turn.

It sounds like scraping brake pads, but it happens when the car is rolling and when it's at idle and get's louder when I rev it in Neutral. The sound is NOT anywhere from the top of the engine, I can hear it best in the cabin and sqatting next to the drivers side tire. Fluids are ok. I have a Radix installed, do you think it's the belt? It doesn't sound like belt slippage. I only have 16K miles on it.

The sound was loud when I started the engine this morning but faded until you can barely notice it, after 10 minutes of driving.

Thanks for your help

Adam

gvaughan55 · April 20, 2004

I'm experiencing the same noise in my '03 Denali with 10,000 miles. You're right in that it sounds like scraping brake pads (but we know it's not). The noise is also similar to a vacuum/air leak. I noticed the noise the day after I had the truck serviced (oil change, etc.). There was another post here on April 1st from "Machine" who has an Escalade that was making the same noise. I emailed him and he said his noise mysteriously stopped.

I'm also experiencing a high pitched whistle at slow speeds, not sure if it's related but it appears to be coming from the same area and preceeds the scraping noise. I wonder if this noise is StabiliTrac related since so far it's been common to Denalis and Escalades.

AdamsDenali · April 21, 2004

my noise ended up being my AC belt. It ended up snapping and I ended up getting it replaced from the dealer.

derek_silverado · April 22, 2004

My mom's 02 tahoe had something like this. I think it turned out to be the tensioner or the a/c compressor.... Don't remember which???

My 92 silverado does the sound you discribe when its cold outside... I think its insuffecient oil flow to the top of the engine.

I doubt that the ladder would be your problem though.

I'ld get those bearing on pulleys checked out.

jhm · April 22, 2004

I would run it thru the carwash, may sound funny but you could have some sand or grit stuck somewhere. At least your truck will be clean.

Plainsman · April 30, 2004

After my 4th compressor now I have that same noise when I have the AC on and its warm outside. The noise comes from the upper passenger area of the engine.

03 1500HD 10,000 miles

I guess the other compressors were bad and they continued to just pump more oil in, so the pressures were way off. Dont quite understand the whole deal.

They replaced the Clutch/Orifice/R134/Compressor/Seals/Oil.

needhelp · August 2, 2004

I have a 2004 Chevy suburban Z71 and it started making this odd noise with less than 1000 miles on it. Doesn't matter if it is in park, or driving down the road, occasionally a noise that sound like squeaking brakes erupts for 5-10 seconds at a time. I can not make it reproduce the noise when I want it to. Any Idea on what could be wrong?

I hate to have to bring it in so soon. Has anyone else heard something like this?