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GMC
Sierra 3500 HD
4

Contamination of extended life coolant on GMC Sierra 3500 HD

Problem Description and Possible Solution
Extended life coolant may become contaminated and require cooling system service before the recommended 100,000 miles.
Problem Data
RepairPal Verified
Average mileage: (–)
4 model years affected: 2007, 2008, 2009, 2010
4 people reported this problem