GMC Sierra 1500 heater not working - causes and diagnosis
wheelsjoint.com
GMC Sierra 1500 heater not working - causes and diagnosis
The heater in GMC Sierra 1500 ensures comfortable temperature in the passenger compartment when the weather is chilly. There are many reasons for poor...
Oct 20, 2022
GMC Heater Repair
This 2020 GMC Sierra Denali 3500 came in with a water-soaked carpet on the passenger side. I cleared the sunroof drains and checked the heater box — still no fix. So I removed the carpet and found it: A faulty roof weld near the third brake light/spoiler area, covered in sealant that had failed. Watch the full diagnostic and repair: ▶️ https://youtube.com/@neighborhood-mechanic?si=YdponVLZQjCnIgRC This is one of those “dealer would’ve charged $$$ and still missed it” situations. #GMCRepair #Wate
6:17
This 2020 GMC Sierra Denali 3500 came in with a water-soaked carpet on the passenger side. I cleared the sunroof drains and checked the heater box — still no fix. So I removed the carpet and found it: A faulty roof weld near the third brake light/spoiler area, covered in sealant that had failed. Watch the full diagnostic and repair: ▶️ https://youtube.com/@neighborhood-mechanic?si=YdponVLZQjCnIgRC This is one of those “dealer would’ve charged $$$ and still missed it” situations. #GMCRepair #Wate
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