Thump Noise From Front Suspension: GM

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GM Tech Tip: Clunk Or Thump Noise From Front Suspension

Some customers may comment on a clunk or thump noise coming from the front suspension while driving over rough road surfaces. This noise will typically occur when the front suspension is returning to the upward position after a hard downward stroke, such as after driving through a large rut or pothole.

Brake and Front End Staff
By Brake and Front End Staff
Published:
gm-suspension-noise-featured

Models:

2008-2011 Buick Enclave, LaCrosse, Lucerne

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Condition

Some customers may comment on a clunk or thump noise coming from the front suspension while driving over rough road surfaces. This noise will typically occur when the front suspension is returning to the upward position after a hard downward stroke, such as after driving through a large rut or pothole.

Cause

This condition may be caused by the jounce bumper slamming into the upper spring seat because it is not retained in the correct up position. The jounce bumper loses position due to oil being deposited onto its retention fingers. The oil is from the strut leaking.

gm 1Correction

Inspect the front strut(s) for evidence of oil. The leak may be slight but will still cause a problem. If oil is present, replace the affected strut, jounce bumper and dust boot (shield). Before reassembling the strut assembly, glue the new jounce bumper and new dust boot (shield) to the upper spring seat using the steps listed below. To confirm this concern, the shield/bumper will easily slide up and down the strut shaft.

gm 21. Clean the surface area of the upper spring seat using fine sandpaper.

2. Apply a light coat of automotive adhesion promoter to the top of the dust boot (shield) on the inside edge and to the top of the bumper. Allow to dry 10 minutes.

3. Glue the bumper to the inside of the dust boot (shield) as shown. Use fast curing adhesive. Allow to cure thoroughly 5-10 minutes at room temperature.

gm 34. Apply a light coat of automotive adhesion promoter to the top of the dust boot (shield) and to the upper spring seat surface. Allow to dry 10 minutes.

5. Glue the dust boot (shield) to the upper spring seat as shown using the above recommended adhesive. Allow to cure thoroughly.

Courtesy of ALLDATA

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R1234yf: Smaller Footprint, New Diagnostics

The benefit of R1234yf is simple. The new refrigerant lasts only 11 days in the atmosphere compared to 13 years for R134a. This is why the EPA is requiring R1234yf to be installed in all new systems by 2021.

Andrew Markel
By Andrew Markel
Andrew Markel is the director of content for Brake & Front End magazine. He has been with Babcox Media for 20 years. He is a technician and former service writer and holds several automotive certifications from ASE and ­aftermarket manufacturers. He can be reached at [email protected].
Published:
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The benefit of R1234yf is simple. The new refrigerant lasts only 11 days in the atmosphere compared to 13 years for R134a. This is why the EPA is requiring R1234yf to be installed in all new systems by 2021. The European Union required the changeover on Jan. 1, 2017.
So, what does this mean for independent shop owners and technicians? Currently, there are approximately 20 million vehicles on the road with R1234yf in the HVAC system. It is not a question of if, but when your shop will have to deal with one of these systems. While working on R1234yf systems is not that different from the R134a variety in operation or theory, identifying the refrigerant and recharging the system has some new twists.

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