AISIN THT-015 Engine Coolant Thermostat - Compatible with Select Lexus GS400, GS430, GX470, LS400, LS430, LX450, LX470, SC400, SC430 Toyota 4Runner, Land Cruiser, Sequoia, Tundra

My Water Pump started leaking on my 2005 Tundra 4.7 It was intermittent for a while, so I just kept the coolant topped up.It started getting worse, so I started ordering all the parts. Water pump, timing belt, ect.I hooked up my OBD scanner to see the actual temperature of the coolant, and it was hovering from 205 to 210, which is hotter than ideal for sure.After a long and exciting repair job, everything is back together, and 2 weeks later, the coolant temp stays at 186-187 consistently.I replaced the water pump, radiator, timing belt, tensioner and drive belt, also, but it's good to know the new Thermostat is working perfectly.I would venture to guess the old one was not Aisin/Toyota. I myself was tempted to get a cheaper one, as the parts list got bigger. But the old thermostat was definitely worn out. The rubber parts were all misshapen and definitely not sealing, or allowing flow like they should.Same with the radiator cap, the rubber was stretched out.So, while I replaced most of the entire cooling system, and the new thermostats effect difficult to say, it good to know it's working perfectly.The temperature would swing +/- 10 degrees when driving around before, now it maybe moves +/- 2.Side note, as many have said before, the dash temperature guage is not very helpful with these things. During the whole fiasco, it never read anything but right in the middle. If you hit 230 or 240 degrees, I'm sure it would let you know, but at that point things are getting bad. I use a $20 Bluetooth obd scanner I got here on Amazon, and it's been a great investment. Has helped me solve several issues.

Fits 2uzfe 4.7L Lexus LX470/ Toyota Landcruiser 100 series. Works well no leaks. Aisin is oem for toyota lexus

Guess it work. Mech didn’t say bad

if you won't quality get these

Great product and brand new fit with no problem

Good price.....aways a BUUTTT. Why of all things......(you) don't sell a gasket.....useless with out it.Had to drive to an auto store to pickup a $3.99 part.

Perfect replacement for my gx470. This was the last piece of a 200,000 mile overheating puzzle. First was radiator cap, second was the fan clutch, third was the thermostat.

Installed in a 2005 Gx470. Thermostat opened when engine got to temp. Toyota owns 30% of the aisin company and is the ideal oem replacement.