jor8888

anyone know where I can buy this part? Looks like O-Ring inside is leaking? thx.

5W40

You may need a new Radiator and which will be under $200 from Rockauto or AutohausAZ as mine one turn out side joint leaking between aluminum and PVC.

kickin8

iTrader: (1)

+1...you need new radiator....

mic575

I had to replace my filler neck on my 2007 but mine was cracked on the small hose nipple to the left of the radiator cap in your picture. I believe I got the replacement at rockauto, easy job and inexpensive. There is a gasket in the neck that I suppose could leak. But as the others say, you may need a radiator. You could try cleaning that area up and keep a close eye on it to see if you can pinpoint the leak.

mandyfig

Agree clean it up and find out where it is coming from, the leak. If you see a crack on the radiator, you will need to replace the whole radiator, which should not be a bad job, or else get a shop to do it for you. I did not know that the filler neck is a separate part from the radiator itself.

mic575

I was surprised that it was a separate piece as well. Once I looked at it it does make sense because the neck has a number of areas that could be prone to cracking by their design. The separate piece saved me here but I also wondered why they designed it in the offset fashion to begin with.

greg569

Does anyone know why Lexus decided to make a replaceable neck, a $17 dollar part on the radiator, where the cap goes, for almost every year other than a few around 2011.
So odd. A thousand threads no answer.
Best

greg569

Lexus calls it a freeze plug. It is not threaded and does not have a gasket. The new ones have threads and an Allen wrench to remove. I found the best seal on Amazon

Bolt squeezes rubber for a perfect fit Then I put some stop leak in. Since I’m OCD about doing things right on cars I’ll be ordering a new radiator, thermostat and fluid. Car was assembled in Canada had tow package. Oil leak from right behind oil change element. Either rear seal, oil cooler lines or hopefully just a pan gasket.