Just to add to this, coolant is not the only important thing, always check the hoses that connect the radiator, the radiator itself and the condenser which is most cases is just under the radiator, top up the AC gas just to be sure. I do not want to advertise any oe company here, but most major service centers and car showrooms offer a free AC check up and discounted parts just before the start of summer. Take advantage of these special packages and you will save yourself from facing issues in mid summer heat.
Here is what you have to do:
Remove trim around gear shift (carefully pry up)
remove screw for cup holder,
remove felt pad in lower console.
remove 2 10mm bolts
Once I had to do that when my center console cracked and I had to replace it with a brand new one (https://www.carid.com/center-consoles/). First, I thought getting an aftermarket overlay piece that would stick-on, but then I realized, that the sound will not disappear (the cracked plastic piece will give that sound under vibration, when you drive).
I had 2003 Lexus GS430 and I still misses it's comfort and super silky V8. It's better to stick to GCC specs, as mine was European specs and in some rare fault Al futtaim rejected to help me. After writing big letters to Lexus Japan, Al futtaim assisted me in finding the fault of wiring short circuit that triggered immobilizer and whole car was dead.
I don't blame local dealer as they were also right in not helping as they didn't had required wiring diagram and minor details for EU specs. Since that day I learned my lesson hard way to pay extra premium for GCC cars, as it worth every extra spend during the ownership and you get better resale when you sell it off.