Genuine Nissan Parts - Authentic Catalog Part from The Factory (21200-31U1B)

Product works as OEM should. Purchased this to replace a non-OEM brand that was about 1/3 the price. Application was a newly rebuilt 2005 Nissan 4.0L VQ40. Due to heat problems with the non-OEM installed on installation of the engine, I decided to test beforehand. Noted improvement over non-OEM in the pot as well at installed on the engine. Pan test included the original OEM, the non-OEM and the new OEM: OEM: 184*F - Began opening 190*F - Open to about 1/16" 198-200*F - over an 1/8" open 205*F - 3/16" or more open. Eg. fully open. OBDII connected to the ECM showed the engine never going over 210*F at 55/65MPH Compared to the non-OEM: 184*F - Closed 190*F - Closed 195*F - Began opening 200*F - just over 1/16" open 205*F - just over 1/8" open. Eg. not fully open. OBDII connected to the ECM showed the engine live temperature creeping to 220*F at 55/65MPH

Perfect fit for my nissan frontier 2005

This arrived safe and sound. I installed it into my vehicle with no problems. All the holes lined up and the OEM gasket that I bought separately fit perfectly as well. Remember that you need a gasket, do not use your old one because you forgot to get one. To get the new thermostat to line up with the gasket while putting it on, put the gasket on it and then put 2 of the bolts/screws in the holes of it. I did the bottom 2 screws. I then placed it where it goes and screwed one in partially, not all the way. If you try to put it on one screw at a time, the gasket will keep slipping off and un aligning. After you partially screw in the first screw, do the same to the other one. Then you can install it with ease. While you’re in there, check your radiator hoses since you have the coolant and thermostat out.

Part came in FedEx bag, in original part box, which was severely crushed. Water tested and found that thermostat opens partially and very slowly at 180 to 190 deg F. Cause to wonder if this part is defective. It looks to be an original Nissan part in original Nissan box (crushed) for my 2006 Infiniti G35 sedan. Liked the option to expedite shipping. No gasket included.

I had installed an aftermarket thermostat, and I kept dealing with overheating issues fluctuation and the gauge. So I've read some reviews on Amazon. And I decided to make the purchase. Haven't had one single issue with temperature! Everything works like it's designed, it's an amazing and quick fix.

Vino rota

Replaced thermostat in 2008 Nissan Frontier. Part was perfect fit, and no issues thus far.

My temperature gauge wasn't going up to normal temperature, so I assumed it was time to replace the thermostat. This is genuine Nissan product and it fixed my problem. Only gripe is it DOES NOT come with a gasket. note: torque bolt to 6ft-lbs

I bought this to replace a brand new motorad thermostat that i installed on my xterra. The motorad was supposed to have the same specs as OEM but it didn't. Replaced it with this OEM thermostat and it fixed the problem. Engine fan hasn't ran since even on the highway, and the engine temp is maintained accurately. I live in Winnipeg MB. so in the winter my heater's blowing full-time, and even with the heater running as long as the truck is running the engine fan was working double time. Once it started warming up and the heater's turned off, especially on the highway, the engine temp would rise over the halfway mark which can't be healthy for your engine. I learned later that it's a "winter thermostat" supposedly intended to provide more heat for your cabin. I wouldn't sacrifice an engine to get warmer cabin heat.

No me gusto el producto no trabajo se atoraba y nunca abría con la temperatura del agua por ende calentaba

Great product, reasonably priced and next day delivery....incredible. The only hang up was the gasket took 5 days .

4stars due to no gasket included. Overall good quality!

Vraiment super.