Replace the thermostat O-ring seals on your 2001-2026 6.6L Duramax diesel. This genuine GM 98280281 O-ring also replaces GM 12680544 and fits Chevy Silverado and GMC Sierra 2500HD and 3500HD trucks with the LB7, LLY, LBZ, LMM, LML and L5P, plus 2006-2016 Chevy Express and GMC Savana Duramax vans.
Features
- Genuine GM 98280281, also replaces GM 12680544
- Fits every 6.6L Duramax from 2001 to 2026
- Sold individually
What's Included
- (1) GM engine coolant thermostat O-ring (98280281)
Before You Order
- Two seals are required to service one vehicle. This listing is for one O-ring, so order a quantity of 2.
- L5P owners: two of these O-rings are already included in our L5P Thermostat Kit.
- The ACDelco thermostats in our 2001-2010 Thermostat Kit and 2011-2016 LML Thermostat Kit come with an O-ring, so you do not need to order this separately with those kits.
Installation Tips
- Drain the coolant before removing the thermostat housing.
- Replace the O-rings any time the thermostats are removed.
- Refill and bleed the cooling system, then check for leaks.
Installation Resources
Related Parts
- Duramax Thermostat Kit, Front and Rear, 2001-2010
- Engine Coolant Thermostat Kit, LML Duramax 2011-2016
- Engine Coolant Thermostat Kit, L5P Duramax 2017-2026
- Thermostat, Rear 180 Degrees, 2001-2016
- Thermostat Housing Crossover Gasket, Set of 2, 2001-2016
- Thermostat Housing Crossover Gasket, 2001-2016
- Water Pump Bypass Upper Pipe Seal, 2001-2016
- Engine Coolant Thermostat Housing Gasket, 2017-2026
- Thermostat Bypass Pipe O-ring, 2017-2026
Frequently Asked Questions
How many O-rings do I need?
Two seals are required to service one vehicle. This listing is for one O-ring.
Is this O-ring included in your thermostat kits?
Two are included in the L5P Thermostat Kit (10427). The ACDelco thermostats in the 2001-2010 (10428) and LML (10513) kits come with an O-ring, so this one is not needed with those kits.
For warranty information, see our Warranty Policy.
