Sierra 1500 Hybrid

Contamination of extended life coolant on GMC Sierra 1500 Hybrid

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: (–)
3 model years affected: 2007, 2009, 2010
3 people reported this problem