Defroster/defogger/hvac System Problems of GMC Sierra 1500

The contact owns a 2016 GMC Sierra 1500. The contact stated that while idling in the drive-through at a pharmacy, the contact noticed smoke coming from the rear window, and the rear window shattered. The contact stated that the defroster was activated at the time of the failure. There was no injury sustained. The contact deactivated the defroster and drove to the residence, where the contact disconnected the defroster fuse. The contact related the failure to customer satisfaction program number: n192265660 (rear window defroster thermal events). The vehicle was not diagnosed or repaired by an independent mechanic. The manufacturer was notified of the failure and referred the contact to the NHTSA hotline to report the failure. The failure mileage was approximately 139,250.

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The contact owns a 2017 GMC Sierra 1500. The contact stated that after remote starting the vehicle, upon entering the vehicle, the contact became aware of a burning odor in the interior of the vehicle. In addition, the contact noticed smoke coming from the rear of the vehicle, and the back glass was fractured. The vehicle was taken to the dealer, where it was diagnosed with a failed defrost resistor. The contact was informed that the defrost resistor needed to be replaced. The vehicle was not repaired. In addition, the contact stated that five years prior, a recall repair was performed, and the defrost resistor was replaced under the recall. The manufacturer was made aware of the failure, and a case was filed. The contact was advised to contact the NHTSA hotline to report the failure. The failure mileage was approximately 109,000.

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The contact owns a 2018 GMC Sierra 1500. The contact stated while driving approximately 35 mph with the rear window defroster activated, there was a burning rubber odor inside the cabin of the vehicle and there was smoke coming from the rear window area. While inspecting the rear window the contact discovered that the rear window connector cover had melted, and the wire connections were a burning amber color, but no flames were present. After disconnecting the electrical connections, approximately 30 seconds later the rear glass panel on the passenger side suddenly shattered. No injuries were reported. The contact’s young daughter was seated in the rear during the failure. The vehicle was taken to the local dealer, but the cause of the failure was not yet determined. The manufacturer was not notified of the failure. The failure mileage was 60,952.

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The contact owns a 2014 GMC Sierra 1500. The contact stated while driving approximately 35 mph, the air conditioning system was activated however, there was no air circulation. The contact stated that the failure of the hvac system caused the defogger and defroster functions to be inoperable. The contact stated that due to the failure of the hvac system to properly defrost the windows, the visibility was reduced while driving. The vehicle was taken to the local dealer to be diagnosed and the contact was informed of a leak in the condenser. The vehicle was repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 55,300.

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The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving approximately 10 - 15 mph with the rear defroster activated on the rear powered sliding window, there was a sizzling sound and started smelling smoke inside the vehicle. The contact pulled over, stopped, exited the vehicle, and started inspecting inside the rear of the vehicle; and saw smoke on the driver’s side rear of the vehicle, between the window and the seat back. While the contact was bent over trying to ascertain where the smoke was coming from, the driver’s side rear window exploded. The contact poured water on the window to put out the smoke. During the explosion the contact sustained a mild concussion and severe earache that lasted for two days; however, medical attention was not needed. The fire department and police department were contacted and notified of the failure. The contact was informed by the fire department that the cause was an electrical system fire. The vehicle was driven to the local dealer to be diagnosed however, the cause for the failure was not yet determined. The vehicle was not yet repaired. The manufacturer was contacted regarding the failure but no assistance was offered. The VIN was not available. The approximate failure mileage was 150,000.