Phoebster

Changed radiator cap, radiator and thermastat and still overheating.

dicer

Maybe go to the proper forum for it.
Oh and lots of things can cause it to over heat. But first thing to check is the gauge is it telling the truth. Does the fan come on? Water pump? Air in system? Radiator blockage? Dirt between the radiator and the air conditioning condenser? Bad hose with blockage?

LXMEUP

If you've changed all that gear, you've got the Waterpump left...

cheezz

Yeah make sure that the air is completely out of the coolant system. Spend good time bleeding air out of the system until there's no more bubbles left.

jr4div2

Why did you replace the radiator cap? Wasn't there an issue on the 350 with the water cap falling apart and parts causing blockages in the water circulation?

Gville350

iTrader: (10)

X2 on the water pump!

2013FSport

iTrader: (2)

It appears to have a steel impeller, unless it's leaking, it is not not responsible for overheating.

Back to square one; what are the signs that it's over heating?
True over heating pushes coolant out of the engine and into the coolant reservoir and is usually accompanied by a plume of steam under the hood. While this is happening if it is not caused by a faulty pressure cap, your engine temp gauge should be pegged and both fans running up front.
Are these things happening??

If it is not discharging coolant, but the gauge is pegged, I'd be looking real close at the engine coolant sensor (ect).
If you have an OBDII reader, read the temp from cold to 10" idle time...

2013FSport

iTrader: (2)

So what happened here @Phoebster

Kikiwhanki

Check your waterpump. First time i am seeing a Lexus getting overheated.

2013FSport

iTrader: (2)

And yer blinker fluid too!