the dash in the duramax lml will rattle. there are two repairs you can try. either replace the heater hose to new style or
#PIP4826: Vibration Moan Or Buzz Type Noise Heard Or Felt Inside Passenger Compartment - (Aug 31, 2010)
Subject: Vibration, Moan, or Buzz Type Noise Heard or Felt Inside Passenger Compartment
Models: 2011 Chevrolet Silverado
2011 GMC Sierra
Equipped with the 6.6 Duramax Diesel Engine ( RPO codes LML and LGH )
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
A dealer may encounter a customer concern of a vibration, moan, or buzz type noise heard from either inside the passenger compartment, or from under the hood. Noise may be described as coming from passenger side front of engine compartment, or from cowl area. The noise is heard better when the engine RPM is raised to between 2300 to 2600 RPM.
Recommendation/Instructions:
If the customer concern fits the noise described in this PI, verify if the noise will change if slight pressure is put on the heater hoses. If the noise dissipates with light pressure applied on heater hose, rotating the heater hose may alleviate the noise.
To rotate the inlet heater hose follow the steps below.
Make sure engine has cooled down, and cooling system pressure has been released.
Squeeze the clamp tangs to loosen the clamp on the EGR cooler heater hose (removal of the hose is not necessary so there should be no coolant loss).
Rotate the hose (approximately 60 degrees counter clockwise) on the steel pipe fitting at the EGR cooler. The heater hose has a molded bend and a quick disconnect fitting at the heater core. After the hose is rotated be sure the molded bend is at the highest vertical point or approximately the 12 o'clock position. Rotate or wiggle the hose connection at the vehicle's body side to remove any pre-load in quick-connect fitting.
Release clamp tangs to engage or tighten the clamp at the EGR cooler.
Please see completed hose relocation below.
Re-evaluate the noise after the hose has been rotated on the EGR cooler fitting.
Please follow this diagnostic or repair 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.
A D V E R T I S E M E N T S
the dash in the duramax lml will rattle. there are two repairs you can try. either replace the heater hose to new style or
#PIP4826: Vibration Moan Or Buzz Type Noise Heard Or Felt Inside Passenger Compartment - (Aug 31, 2010)
Subject: Vibration, Moan, or Buzz Type Noise Heard or Felt Inside Passenger Compartment Models: 2011 Chevrolet Silverado 2011 GMC Sierra Equipped with the 6.6 Duramax Diesel Engine ( RPO codes LML and LGH )
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
A dealer may encounter a customer concern of a vibration, moan, or buzz type noise heard from either inside the passenger compartment, or from under the hood. Noise may be described as coming from passenger side front of engine compartment, or from cowl area. The noise is heard better when the engine RPM is raised to between 2300 to 2600 RPM.
Recommendation/Instructions:
If the customer concern fits the noise described in this PI, verify if the noise will change if slight pressure is put on the heater hoses. If the noise dissipates with light pressure applied on heater hose, rotating the heater hose may alleviate the noise.
To rotate the inlet heater hose follow the steps below.
Make sure engine has cooled down, and cooling system pressure has been released. Squeeze the clamp tangs to loosen the clamp on the EGR cooler heater hose (removal of the hose is not necessary so there should be no coolant loss). Rotate the hose (approximately 60 degrees counter clockwise) on the steel pipe fitting at the EGR cooler. The heater hose has a molded bend and a quick disconnect fitting at the heater core. After the hose is rotated be sure the molded bend is at the highest vertical point or approximately the 12 o'clock position. Rotate or wiggle the hose connection at the vehicle's body side to remove any pre-load in quick-connect fitting. Release clamp tangs to engage or tighten the clamp at the EGR cooler. Please see completed hose relocation below.
Re-evaluate the noise after the hose has been rotated on the EGR cooler fitting.
Please follow this diagnostic or repair 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.
- jst, Bedford, IN, US