Service VME - Knocking Noise Underhood When Driving Over Rough Roads - kw clearance excessive hood knock

The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

A driver may encounter a knocking noise underhood when driving over rough roads. This noise may be coming from the radiator moving up and down due to excessive clearance at the radiator hold down support. The radiator hold down bracket bushing may not be thick enough to make contact with the radiator. To correct this condition install a piece of foam above the existing bushing or split another bushing to eliminate the clearance between the radiator and the hold down bracket bushing.

.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.

(2004 Buick LeSabre) and (2004 Pontiac Bonneville)

.