Change spark plug

If you are not sure what you are doing when repairing a car get a qualified repairer to do it for you.
The most common reason for overheating is a bad thermostat in the cooling system Get that checked and replaced if it's bad. they're usually cheap to buy.
The Spark plugs will not cause overheating. What exactly do you mean by "tried to change the spark plugs"?

You change spark plugs every 3 years,
regardless of mileage,then you can forget
about them, if you have other issues, as the years
go by

I assume you do not work on your own vehicles, if
you do not say you do & if you had experience,then
spark plugs wouldn't be the issue

That said, I have no idea why your asking.

I would guess you never go to a repair shop, or we
have no idea why the question !

no
the mechanic broke the studs so the shop is responsible for the repairs

A repair shop can install an insert to repair the threads.

Hello epereira.
If you did not change the spark plug at the same time it may be overloading the ignition coil. Also there may be a broken, worn or carbon tracked insulator on the spark plug.

(1) If the gap is worn it makes the coil work harder trying to jump the gap.

(2) If the spark plug insulator is broken it may not be a coil problem at all.

(3) If the porcelain insulator on the spark plug has dirt or carbon on it the spark may be following it on the outside of the plug rather than jumping the gap at the end.

I would recommend you get a pro to change your spark plugs on this engine. They can be a problem to remove and reinstall properly and very expensive to repair if not done correctly.

not to bad you'll need long extension, front one are there in view, the back one's remove spark plug boot (long one) and with extension you can reach spark plug's.

if its your first time you need a haynes repair manual.you need a spark plug boot puller.you need 3/8 ratchet wrench.spark plug sockets.from size 5/8 to 13/16.you probably need size 5/8 socket.you need extensions different sizes.and universal joints.to reach hard to get plugs.you need torque wrench. and spark plug gap set.

Yes, it is very hard to change the plugs. Your lexus also likely has coils on top of the plugs, which you especially don't want to break. I would recommend taking the car into a dealer for the repair.

unless you have a specific issue with the plugs , don't waste your money changing them
the v6 engine has the rear plugs as platinum plugs because it is near impossible to change them and modern engines
( manufacturer design fault in the location of the engine and so they fitted special plugs before installing the engine )
plugs last the life of the engine
if you are doing a "tune up" that is a waste of money as the ECM tunes the engine 60 times a minute
all you have to do for a "tune up" is to have the fault codes read for sensor problems