Horrid Screech

I have this horrid screech going on whenever the car is moving. It goes away when stopped or hitting the brakes. it happens under acceleration, while coasting, or when locking the doors with the remote. I can hear it inside and outside of the car. At first I thought it was my brakes hitting the rotors, but since it happens when the horn/lights flash I'm not so sure. It also happens with the radio on or off. Help?

If you could pinpoint where the screech is coming from, by listening and feeling for it while it is screeching, would really narrow it down. You mention the radio. Do you think the sound is coming from your speakers?

I pinpointed it to the back area. I figured it could possibly be the speakers since that's the only change I've made lately. The battery light, washer fluid low, and one other light flash every now and then.

Also back on the speaker shelf is the module for the door lock remote. You could try unplugging it and see if the screech stops. You will loose your remote til its plugged back in so dont lock your car if your key doesn't work to open it.

In all seriousnous, isolate, isolate, isolate!
all plug stuff one at a time and see what happens, unplug speakers etc.

I've isolated it to the back. Since it's heard radio on or off, I doubt it's the speakers. I also tried changing which speaker the music was coming from, made no difference. I can't really isolate it any more than that because it would be hard to crawl around the back while driving. Could those lights flashing be any indicator? (Battery, washer fluid, low fuel and one other) Should I try a new battery?

Have you tried unplugging that keyless entry module back there?

I have no idea where it is or how to get to it.

How about the ALC compressor? Could the right kind of air leak create that sound? Try unplugging the relay for the ALC under the rear seat.

If you lay on your back in the trunk and look up, just left of your right speaker, you will see a black box. It is maybe 4 " x 7". Just unplug the wires going to it. If the problem is still there after unplugging it, just plug it back in. If the problem goes away, then you found your problem.

LARRY70GS wrote:

How about the ALC compressor? Could the right kind of air leak create that sound? Try unplugging the relay for the ALC under the rear seat.

think you might be onto something here. Could be the level system making the sound and you just happen to notice it when outside the car locking/unlocking it. and it may not com on during braking because of the cars weight shift making the rear end rise above "ON" threshold.
Another thing to do is pull the rear seat and see if the squeal get louder.

Thanks for the guess on the ALC compressor. I'll try that after school. When I got here I unplugged and re plugged the remote button. Will post results tonight.

I was thinking you would unplug the lock module and leave it unplugged.

I re-read it and saw that you had said that. I tried it both ways, neither fixed it. I didn't get to the compressor today or taking the back seat out (mainly because it was really freaking cold). At least we can confirm it's not the speakers or the remote module thing. How can I troubleshoot where/what on the compressor is making the noise if it is the problem? On a side note, ordered a woodgrain kit today.

If you do find it is an ALC problem, the noise is most likely some sort of air leak. Could be in the lines or compressor, so a visual inspection would be the first thing to do. The compressor is under a shield in the right rear corner of the car. I'd get the car on a lift and have a look.

Will try and get it on a lift, or at least some ramps soon. Will post back with pictures and findings.

It's confirmed to be the brakes . Need to get it taken care of asap. One of the pads appears to be rubbing the rotor 24/7 (right rear?).

hey matt check these out. they are powerstop slotted and drilled plus pads and its cheaper than autozone for just the rotors for our cars. im ordering mine next payday
http://www.ebay.com/itm/290701374188?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649

I saw those. I was going to get them when my brakes and rotors needed done because I like to drive hard and the F body upgrade would take more time and effort than it's really worth because I have a 96.

yeah me too im takin it lazy on those lol. besides i think they are about the same weight as fbody mod and look better on all 4