Review on 🔧 ACDelco GM Original Equipment 131-131 Engine Coolant Thermostat: Efficient Cooling Solution for Optimal Engine Performance by Cody Cobbs

Identical replacement to the one that came from my 2002 Chevy 2500HD Duramax. My original thermostat was stuck open so it took over 30 minutes for the engine temp to rise above 165 degrees Fahrenheit which is way too cold for this engine to run. After swapping out with this one (and swapping out another thermostat too - this engine has two thermostats side by side under one housing, one opens at 182 and the other at 185 degrees), the engine was up to temp like it should, in 10 minutes or so So. Changing this was pretty easy. I drained the coolant by removing the lower radiator hose (there is a drain cock on the underside of the radiator, but having broken a few of these on other cars, I only ever pull on the lower radiator hose). Intake resonance chamber, pulled out the positive cable from the alternator and loosened a few cable connections. After that we managed to pull out the thermostat housing, clean it with a razor blade and put it back together. You don't need a gasket on the thermostat housing - you just need the thermostat rubber gasket that came with the parts. Fill with 50/50 Dexron coolant and distilled water, then bleed the cylinder block (there is a bleed screw on top of the case). You can use the thermostat housing for this). After bleeding the air, he started the engine and let it warm up until the thermostats opened (you can feel the upper radiator hose warming up). As soon as the thermostats open it will start sucking liquid from the coolant reservoir, so make sure it's full. In general, the work is easy. It took about 4 hours. Problem solved.