Duramax Upper Thermostat Housing 2004.5-2010 LLY LBZ LMM

As our trucks age this thermostat housing often becomes the source of leaks. During service, always check for corrosion around its sealing surfaces. We see a lot of these housings with cracked mounting flanges and stripped threads. Nobody wants to do the job twice!

This housing fits 2004.5-2010 Duramax Trucks equipped with LLY, LBZ and LMM engine platforms. 

Replaces GM 97361881