PIT5496: Buzz / Rattle Noise From Right Rear Of Vehicle – 2015-2016 Cadillac Chevrolet GMC

#PIT5496: Buzz / Rattle Noise From Right Rear Of Vehicle – (Feb 23, 2016)

Subject: Buzz / Rattle Noise From Right Rear Of Vehicle
Models: 2015 – 2016 Cadillac Escalade Models
2015 – 2016 Chevrolet Tahoe and Suburban
2015 – 2016 GMC Yukon Models

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

 

Condition/Concern

Some customers may comment that they hear a rattle or buzz noise from the rear of the vehicle.  It may be most noticeable when driving 35 to 40 MPH or while in gear at a stop.

 

Recommendation/Instructions

Road test vehicle to get it up to operating temperature so concern can be duplicated.  Remove right rear inner fender well and inspect the rear auxiliary heater / evaporator lines for contacting each other.

rear auxiliary heater / evaporator lines

rear auxiliary heater / evaporator lines

rear auxiliary heater / evaporator lines

rear auxiliary heater / evaporator lines
If the lines are found to be contacting each other, loosen the retaining clamps and reposition lines to gain clearance, then retighten retaining clamps.

 

Warranty Information

For vehicles repaired under warranty use:

Labor Operation Description Labor Time
4480418* Reposition Aux Evaporator or Heater Core Pipes 1.0 hr
* This is a unique labor operation for bulletin use only.

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.

 

 

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