I bought two radiator caps from toyota stealership, one with part number 16401-20353 88kpa, the other one is 16401-36020 108kpa
does anyone know which one will fit the rx300? are they interchangeable?

 

To be safe, call the Lexus dealership with your VIN number. Once they give you their part number you can then check to see the max pressure rating. Year to year and AWD/FWD differences can lead to different pressure ratings. If you must use one, then use the lower pressure rating till the right pressure is determined. This way the worst thing you can experience is loss of fluid. If you use the higher pressure cap you may stress out some other component of the cooling circuit. It is almost like using higher Amperage fuse.

Salim

 

Quote:

Originally Posted by bronzemaxe

I bought two radiator caps from toyota stealership, one with part number 16401-20353 88kpa, the other one is 16401-36020 108kpa
does anyone know which one will fit the rx300? are they interchangeable?

Manufacturer: Toyota; Part Number: 16401-36020; Part: Radiator Cap; Replaces: 16401-62100, 16401-31520, 16401-31792.
just picked up this morning 16401-36020, for my 2001 rx300 for a 1999 according to a lexus on line dealer the first one 16401-20353

 

my original radiator cap on my 99 rx300 awd, which is 2 decade old - 88 kpa, my guess it is safe to keep it the same spec. 16401-20353

 

In this case "Yes". If had traded hands before you then you are at mercy of the previous owners doing. The other good thing is that you have been using this for years.

Salim

 

i took possession of this vehicle 2 decade ago from Lexus dealership parking lot with 6 miles on the odometer, at the time i signed the all the paperwork, have to wait 2 weeks, because vehicle was still on the boat.
the radiator cap is original, never been changed.