GM Genuine Parts 131-163 (97241129) Engine Coolant Thermostat with Gasket

Fit like o.e. , functioned like o.e. because that's what it is O.E.M.

This worked great in my 2015 GMC3500HD. I checked around locally and no one had stock. Amazon did!

Just what the doctor ordered original OEM GM thermostat. When only the best will do

I needed to replace both of my thermostats on my 2004.5 Chevy Silverado 2500HD with the LLY 6.6 diesel engine. Not to hard of a job to do just a little time consuming because it's good to flush and replace the Dexcool coolant at the same time. You need both thermostats....180 & 185 degrees to do the job right. Truck runs like it should and the heater too. They should be changed at least every 100k miles or sooner it you are having problems.

This is the front thermostat in the trucks thermostat housing 185 deg. Like other reviews have said it's a little tricky to replace but with about 1 1/2 hours and a little care it can be done by the average mechanical person. As in other reviews I considered removing the air conditioner compressor for better access but in the end only removed one bolt. It took a little time to get the air out of the system, unlike other reviews I didn't fine a bleeder screw on top of the housing. Because my truck is mostly run in warmer temperatures I was unaware I had a problem until I got a code for lower than expected engine temps. Now that I look at the engine temp I do see to come to temp quicker and run's right at the normal temp.

I've ordered several of these, some new via Prime, some used via Warehouse Deal. I have received new Prime products in plain white boxes only and others in a plain white box inside an ACDelco box. The plain white boxes say Made in Japan, and have an 8 and 10 digit part number. These white boxes are ACDelco original and match what I received from the dealer. Beware, however, if you order a used Warehouse Deal, I've received knockoff brands and wrong parts.

fit my 09 Silverado just as expected

proper oem quality, proper fit, easy to install, measures temps accurately, good value

Thermostat corolla 1998 not same. That why, I returned. Thanks

and also twice cheaper then local dealer parts store. Took about 1 hour to replace it. You also need about 1 gallon of dex cool to top it

Excelente

Works great

Installed with - 131 to complete two thermostat installation