Genuine Toyota 90916-A3003 Thermostat

Installed in 2006 sienna. Worked perfectly.

While the thermostats did look slightly different, the rated operating temperature for both the old and new thermostat was marked at 82 degrees C, so I knew that they would operate the same. Installed with a new gasket and so far there are no leaks. Engine temperature stays smack dab in the middle like it should now.

Always nice to get a solid OEM part instead of the janky stuff out there, gives me confidence that this will last as long the original one it replaced.

I never thought OEM versus aftermarket mattered, but I replaced the thermostat in my 2002 Toyota Corolla with an aftermarket thermostat from AutoZone and I kept getting a check engine light. Come to find out it was due to an aftermarket thermostat. Definitely worth buying OEM on this.

Got this thermostat for my 2014 Toyota Camry 4 cylinder 2AR-FE engine. Keep in mind that the OE thermostat doesn't come with the gasket. Just the way Toyota does it I guess. Also it's worth getting the OEM gasket as well as I could definitely tell the difference in sizing between the OE and the "Murray" brand from O'reilly's. The aftermarket gaskets are prone to leak and that's defintely why. Also note, the 4 cylinder and V6 engine both take the same thermostat part number, however they have different gaskets between the two engines so make sure you don't make the same mistake I did and order the gasket for the correct engine.

This replaced the thermostat on a 2012 Camry SE 4-cyl (AR2FE engine) with 130k mi. Hoses, belt, and coolant were changed out at the same time (first time for this vehicle). Unfortunately and frankly inexcusably, the thermostat gasket is NOT included (simply a consumer ripoff by Toyota). Fortunately in my case, the old gasket was still in good enough shape to reuse (I also applied AT-205 on the gasket to hopefully prolong the rubber gasket's life expectancy).The old thermostat did show signs of rust and age. So, I'm happy it was changed out.On this engine, be sure to orient the jiggle valve at the 12 o'clock position. Regardless, it's always a good idea to observe the jiggle valve orientation before removal. Hopefully, the new thermostat will do it's job for another 130k mi.

Looks sturdy and appears to be a genuine Toyota part. With my 2003 Toyota Camry V6 3.0, there are 3-10mm nuts that have to be removed to take off the thermostat housing that contains the thermostat. I also ordered the Water Inlet Housing Gasket (Toyota Part# 16325-62010) which is the rubber gasket that fits around this thermostat so it doesn't leak. The thermostat housing then can be pulled off the 3 threaded studs. I also removed the air cleaner and any vacuum lines, and even a wire harness plastic attachment piece that I thought would facilitate more room for this job. I try to remove anything I can to make it easy on myself. One tip that really makes working on engines much easier is labeling the vacuum lines and where they attach with the same color nail polish; it dries quickly and you'll never have a problem or worry about connecting vacuum lines on your engine again.The top nut is the easiest to see and remove after putting a 10mm socket with an extension on it. The nut toward the firewall is a little difficult; you just have to maneuver the ratchet with an extension around the wires or tubing. You can use your fingers to feel where the nut is to give you an idea of how to place a 10mm socket on it. The 3rd, and last nut, is underneath the thermostat toward the front of the car and can be difficult to get a socket on; I couldn't see it at first. I then realized if I looked straight down from above wth a flashlight, I could see this nut. You could use a ratchet with a straight extension as with the other nuts, or even better if you have it, use a wobble extension. I also found that when reattaching the thermostat housing to the engine with the three nuts, using an extendable magnet tool, although not necessary, was helpful in putting the nuts on the studs initially. Then, after starting the nuts on the threaded part of the studs with the magnet, I used the 10mm socket with the extension to tighten the nut the rest of the way.One caution-After I first put the new thermostat gasket on the thermostat, I placed the thermostat against the engine, guided the thermostat housing against the thermostat via the three studs and attached the 3 nuts. It leaked. I had unknowingly pinched the gasket when tightening/positioning the thermostat with the the new attached gasket against the engine. I should have known it wasn't flush as the one nut (back nut,closest to the firewall) was harder to tighten than the others. Take your time and, if you have one, use one of those extendable mirrors to assure that the thermostat gasket isn't protruding somewhere. A good light source is very helpful for this job.You also might want to replace the water inlet O-ring(Toyota Part# 9676135031) that is attached to the silver colored metal tube that gets pushed inside the thermostat housing when reassembling everything. Mine looked fine after 16 years, but while I was there...

The OEM Toyota Thermostat was a perfect fit for my 2003 Toyota Camry. After over 330,000 miles, I decided it was time for a replacement. It worked flawlessly.