GM Genuine Parts 15-11057 (12600172) Engine Coolant Thermostat Water Inlet Assembly

Works as it should. Fits properly. Would be nice if it included the hardware as I had to source those separately.

Purchased this for my 2004 Chevy Tahoe and it’s a direct fit. Comes with everything you need to make this job quick and easy. OEM standard quality for a fraction of local parts stores.

This is an updated Thermostat housing for older models requiring a water pump replacement. I used this on a 2003 Express with the 6.0L gas engine. People have knocked this for being made in Japan. It's a lot better than Chinese made junk. Works well and the Thermostat has a seal on it. Recommend using a sealant for the housing to water pump.

Running fine on a 2002 sierra 5.3 swap. I used ebay silicone hoses they run cooler and look better. Suprised this has not leaked, nice design on the fill neck and gasket. No rtv was used

Feels like quality, fits the ac delco water pump perfectly.

Quality seems good, but it did not fit my son's 2003 Silverado with a 5.3L engine. His truck has the "integrated" thermostat/housing. Didn't realize this until after I purchased this new one and attempted to replace it while replacing the water pump. Had to pick up the correct thermostat at the local auto part store. Product page did say it fit this truck, and I'm sure in some cases it would. Just not in my case.

Husband ordered to replace thermostat on his truck. Must have worked cause no complaints.

Perfect fit to my new Water pump. Operates very well.

Perfect fit to new ACDelco water water pump.

I put the thermostat and housing in my 2004 Chevy Avalanche Z71 2 years ago and they are a perfect fit for the engine...Still going strong

Excelente

Item arrived as described and was the right part. Easy to install. Works great.

Tengo una Chevrolet Silverado 2003 1500 (2500 en Mexico) y solo le he puesto refacciones originales cuando las he necesitado