Hello,
I have a 1992 Pontiac Bonneville with almost 140,000 miles on it and had it for 2 years and the second owner of it, and I take great care of my cars.

Everytime I turn the steering wheel to the left about 20 degrees or more while driving, I hear a squeaking noise coming from the driver'* side and underneath the dashboard. It doesn't make the sound when you are driving straight or steering to the right. (It'* not the brakes or the serpentine belt.) It'* been going on for 6 months. I took it to a dealer and an independent service shop, and they were to lazy to take it for a drive especially when they were not busy working on other cars at all.

Any suggestions on what the problem is will help.

If it has been this long then it may be something to do with your drive shaft or axle.

Not an expert but it may be a starting place to look. Keep an eye on this post and just wait til the "experts" put in their input.

Good luck

Ok, this might sound dumb, but for starters, is the noise originating from inside or outside the car?

I hear it inside of the car.

If it doesn't get louder with your head out the window (watch out for large bugs), I'd be looking at every point under the dash that the dash itself attaches to the subframe. Another neat trick to rule out a door seal is to shut the door with a piece of newspaper in between. If it sounds like under the dash, and it'* the door, put the paper on the hinge side, eh? Probably not the door though. Even the fuse panel might be squeaking under there. Tighten every damn bolt you can lay your hands on, but be gentle with the steering column mounts. They can crack if over-torqued.

1992 Pontiac Bonneville V6-3800 3.8L Copyright@ 1997, ALLDATA Corp. 1-888-968-3494 C2.00
Vehicle: All Technical Service Bulletins
Front Coil Spring Noise Over Bumps
Bulletin Number: 93-3-18
Reference Number: 203301R
Publish Date: 8/93
Subject:
FRONT COIL SPRING NOISE (INSTALL SLEEVE ON LOWER COILS/INST ALL NEW DUST SillELD)
Models Affected:
1992-93 BONNEVILLE MODELS
THIS BULLETIN IS BEING REVISED TO INCLUDE THE 1993 MODEL YEAR. THIS BULLETIN CANCELS AND REPLACES BULLETIN 92-3-9A ISSUED 7/92. PLEASE DISCARD BULLETIN 92-3-9A.
CONDITION:
Two conditions may occur in the front strut assemblies that may cause noise to be transmitted to the passenger compartment.
A. Coil Contact Noise -This condition occurs when the two bottom coils of the sprtDgs contact each other as the vehicle is driven over bumps.
This condition is often mistaken as a rattle in the dash and is most predominant on, but not limited to, the following spring codes: CHF, Cllli, CHL, CHM, CHN, CHP.
B. Dust Shield Noise -This condition is a plastic to metal squeak or itching that occurs in cold weather over bumps.
CORRECTION: A
1. Verify that the noise is coil contact noise by spraying tracing powder on the lower two coils of the front springs.
2. Drive or jounce the vehicle and check for contact points between the coils.
3. Once coil contact has been identified, clean the spring, apply Kent Industries 10140 or 3M # 76/77N or equivalent high tack adhesive to the lower two coils and instal1 sleeve PIN 22077538 to cover the contact point.
CORRECTION: B
A new dust tube (GM Part Number 22129001) has been released for service. Follow the service manual for instal1ation instructions.
Parts are currently available from GMSPO.
WARRANTY INFORMATION: (CONDITION A)
Labor Operation No.: T5273
Labor Time: .3 hr. (One or Both)
WARRANTY INFORMATION: (CONDITION B)
Dust Tube Instal1ation See Labor Time Guide

Funny. I just started getting this noise. Cold weather, huh? VERY interesting.

Sounds resonable, but I still hear it when just driving over smooth terrain when steering to the left. However, I do hear it when going over bumps.

My gut tells me you have an interior trim squeak. The TSB sounds like my problem that started yesterday.

I know its not that.