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USD 117.72
Part #: ME10428

Merchant Automotive 10428 Engine Coolant Thermostat Kit

Vehicle Fitment:
2001-2010 GM 6.6L Duramax LB7/LLY/LBZ/LMM
Part #: ME10428
★★★★★ ★★★★★ 1 Reviews
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XDP has the Merchant Automotive 10428 Engine Coolant Thermostat Kit that will replace the stuck thermostats in your 2001-2010 GM 6.6L Duramax. A blocked thermostat could be the cause of your Duramax diesel truck not heating up or overheating. The thermostats on your 2001-2010 Duramax 6.6L V8 truck can become stuck open or closed over time, creating heating and cooling troubles. To complete the installation, this thermostat kit contains the front and rear thermostats, as well as the oil fill tube seal and upper radiator pipe seal.

The front thermostat on a Duramax Diesel engine is symmetrical in shape and placed in the forward position of the thermostat housing. When the temperature reaches 185 degrees, the valve opens, allowing coolant to flow to the radiator. On a Duramax Diesel engine, the rear position thermostat is placed near the fire wall. It's distinguished by its offset design and built-in bleeder valves. At 180 degrees, it opens, allowing coolant to flow to the radiator.

  • Includes New Seals
  • Direct-Fit Replacement
  • Front & Rear Thermostat Included
  • OEM Temperature Thermostats (185 & 180)
Kit Includes:
Oil Fill Tube Seal
Rear Thermostat
Front Thermostat
Upper Radiator Pipe Seal

Vehicle Fitment

2001 Chevy 6.6L LB7 Duramax
2002 Chevy 6.6L LB7 Duramax
2003 Chevy 6.6L LB7 Duramax
2004 Chevy 6.6L LB7 Duramax
2004.5 Chevy 6.6L LLY Duramax
2005 Chevy 6.6L LLY Duramax
2006 Chevy 6.6L LLY/LBZ Duramax
2007 Chevy 6.6L LLY/LBZ Duramax
2007.5 Chevy 6.6L LMM Duramax
2008 Chevy 6.6L LMM Duramax
2009 Chevy 6.6L LMM Duramax
2010 Chevy 6.6L LMM Duramax
2001 GMC 6.6L LB7 Duramax
2002 GMC 6.6L LB7 Duramax
2003 GMC 6.6L LB7 Duramax
2004 GMC 6.6L LB7 Duramax
2004.5 GMC 6.6L LLY Duramax
2005 GMC 6.6L LLY Duramax
2006 GMC 6.6L LLY/LBZ Duramax
2007 GMC 6.6L LLY/LBZ Duramax
2007.5 GMC 6.6L LMM Duramax
2008 GMC 6.6L LMM Duramax
2009 GMC 6.6L LMM Duramax
2010 GMC 6.6L LMM Duramax


  • MFG. Number 10428
  • Manufacturer Name Merchant Automotive
  • Shipping Weight 0.70 lb.
  • Shipping Length 6 in.
  • Shipping Width 6 in.
  • Shipping Height 4 in.
  • Fuel Type Diesel
  • UPC 604947011374
  • Warranty Yes
  • Warranty Info 1 Year
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Internal L0.00R1.00


★★★★★ ★★★★★
5.0/5 Stars out of 1 Reviews
Verified Buyer
2 day shipping on an”almost” complete kit
Replaced the thermostat in my LLY… I’ve seen videos of the quick-n-dirty method of replacing the thermostat where the oil fill tube and A/C compressor were left in place… good for you if you can successfully do it this way…. Being my first time on the LLY, I decided to get everything out of the way… which is where the two new O-rings come into play… I don’t plan on replacing the thermostats again for another 100k miles so why not replace all the wear items and insure a leak-free install. I said this kit was “almost” complete for this reason: installation of the thermostat requires draining the coolant… there is one more small O-ring on the radiator drain plug which, IMHO, should also be replaced… I pulled a new one out of my stash… but for some, it would be nice to include this third O-ring in this kit. A small thing to be sure… and not a deal breaker… for the competitive price and quick arrival at my home, I’d definitely purchase this kit again…

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