I recently installed the ACDelco GM Genuine Parts Thermostat Water Inlet Assembly on my 2001 GMC Yukon with a 5.3L engine, and I couldn't be happier with the results. The assembly came complete with a thermostat and an upgraded gasket, which wasn't even shown in the stock picture—nice surprise!

The installation was straightforward, especially with the help of a few YouTube tutorials. I paired it with an ACDelco water pump and drive belt tensioner to ensure everything was fresh. The fit was perfect, like it was made specifically for my truck. I didn’t even need to use RTV silicone because everything sealed so snugly.

One thing I appreciate is the improved design over the original part. The steel thermostat feels sturdy, and the included seal adds an extra layer of reliability. After a few weeks of driving, no leaks, no overheating—just smooth performance.

If you're replacing your water pump or dealing with a leaky thermostat housing, this is a solid choice. Just double-check your vehicle’s compatibility since some models (like certain Silverados) might require the integrated thermostat/housing instead.

Overall, it’s a quality OEM part that delivers exactly what it promises. Plus, getting everything from Amazon made the process hassle-free. Definitely recommend for DIYers looking for a durable fix!