Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
There has been a service bulletin for that type of concern. Here is what it states.
Bulletin No.: 06-02-32-007E
Date: March 09, 2009
This bulletin is being revised to update the models to 2009 and to update Cause # XXXXX Please discard Corporate Bulletin Number 06-02-32-007D (Section 02 - Steering).
Some customers may comment on a clunk noise heard and felt in the steering wheel while driving at slow speeds and turning. The clunk noise may appear to be directly in front of the driver. Hitting a bump while turning can produce the clunk noise. Sometimes the noise may be duplicated when the vehicle is sitting still and the steering wheel is turned 90 degrees in either direction before initially centering the steering wheel.
The clunk noise may be caused by a slip/stick condition between the inner and outer components of the intermediate shaft.
Hydraulic Assist Power Steering
In the unlikely event that the source of the noise is identified as a second design shaft with black painted tube, it must be replaced.
Correction 1 (Only for First Design - DO NOT USE FOR 2ND DESIGN)
Lubricate the intermediate shaft with steering column shaft lubrication kit, P/N 26098237.
1. From inside the vehicle, remove the instrument panel insulator panel left side panel to gain access to the intermediate shaft.
2. Remove the intermediate shaft to steering column attachment bolt.
3. Remove the intermediate shaft from the steering column.
4. Extend the intermediate shaft all the way. Using the intermediate shaft grease kit, P/N 26098237, inject the grease into the gap between the inner shaft and the outer shaft as you are collapsing the shaft. This will draw the grease into the shaft.
5. Cycle the shaft up and down several times to distribute the grease.
Important: Remove original thread locker material from the bolt and apply Loctite(R) 242 (or equivalent) to the threads of the bolt and reinstall intermediate shaft bolt.
6. Install the intermediate shaft to the column.
7. Wipe off any excessive grease on the intermediate shaft to avoid damage from drips on the carpet.
8. Install the instrument panel insulator panel left side.
9. Verify that the noise is no longer present.
There may be interference between the clamp and the steering gear input shaft. The clamp is beveled and if forced down on the input shaft too hard, it may cause a loose fit with the intermediate shaft to input shaft joint.
To correct this condition, perform the following steps:
1. Loosen the intermediate shaft pinch bolt at the steering gear end.
2. Pry the clamp up using a pry bar to position the bolt into the upper part of the groove as shown above. This will position the clamp off the bevel.
3. While keeping the clamp in the upper position, tighten the bolt.
Apply blue LOCTITE medium-strength threadlocker 242(TM)
Tighten the bolt to 49 Nm (36 lb ft).
4. Verify that the clunk noise is no longer present.
Important: This condition ONLY applies to 2004-2007 Chevrolet Malibu/Maxx and 2005-2007 Pontiac G6.
Some customers may comment on a knocking or rattling type noise from the front of the vehicle when driven at low speeds and over bumps. The noise only occurs when the steering wheel is in the straight ahead position and sounds like the noise is in the left suspension of the vehicle or directly in front of the driver.
1. Ensure the noise is not caused by Condition # XXXXX
2. Determine the source of the noise. Install the chassis ears at the following locations:
3. If the noise is coming from the upper strut mount or sway bar link, replace as necessary and retest.
4. For 2004-2006 Chevrolet and Pontiac model year vehicles, the noise may be coming from the radiator surge tank area. (The 2007 model year vehicles use a different style radiator surge tank refer to Step 9.)
5. If the noise is coming from the radiator surge tank, release the two retaining tabs holding the radiator surge tank and reposition the tank away from the attaching bracket and isolate with closed cell foam.
6. Cut three pieces of closed cell foam, P/N P46515 (or equivalent), into 25 mm (1 in) by 102 mm (4 in) pieces.
7. Cut two pieces of closed cell foam into 25 mm (1 in) by 6 mm (1/4 in) pieces.
8. Install the three pieces of foam to the attaching bracket starting at the top center inside the bracket and proceed down across the fuel lines, then at the inside of the bracket at the left and right positions of the center piece of foam. Finally, install the last two pieces of foam to the inside bracket at the left and right extended sides behind the retaining holes as shown above.
9. Reposition the radiator surge tank back onto the bracket and seat the two retaining tabs on the tank.
10. Drive the vehicle to verify that the noise is no longer present.