Lexus RX300 Radiator Cap

Your Lexus RX300 will be happy to know that the search for the right Radiator Cap products you’ve been looking for is over! Advance Auto Parts has 8 different Radiator Cap for your vehicle, ready for shipping or in-store pick up. The best part is, our Lexus RX300 Radiator Cap products start from as little as $11.94.

When it comes to your Lexus RX300, you want parts and products from only trusted brands. Here at Advance Auto Parts, we work with only top reliable Radiator Cap product and part brands so you can shop with complete confidence. Some of our top Radiator Cap product brands are Carquest Premium and Futaba. We’re sure you will get the right product to keep that RX300 running for a long time.

We even have reviews of our OEM and aftermarket Radiator Cap products to help you buy with confidence. Hear from other customers via the 405 reviews on parts for your Lexus RX300.

Shop online, find the best price on the right product, and have it shipped right to your door. If you prefer to shop in person for the right Radiator Cap products for your RX300, visit one of our local Advance Auto Parts locations and you’ll be back on the road in no time!

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Radiator Cap for a Lexus RX300

Use the fitment form at the top of the page to select your exact year and engine type for your Lexus RX300.

Sankei Switches - Sankei Switches Radiator Cap (Part No. G101045813SAK)
Description
The Sankei Switches radiator cap range has been developed to operate within original equipment manufacturer's specifications. A faulty radiator cap can cause your car to boil-over at a lower temperature. Test or replace the coolant cap when servicing the cooling system.

Product Features:
Meets Original Equipment specifications.
Made from premium materials.
Designed to function on open cooling systems and overflow reservoir type systems.

5.0

Read 1 review(s)

Review snapshot ® by PowerReviews

5.0

5.0

5

5

2017-11-29

5

5

Quick and easy

Quick and easy

Submitted 2017-11-29

By Jody

From undisclosed

Perfect fit, fast shipping

Bottom Line NULL

Perfect fit, fast shipping

By Jody from undisclosed

BOTTOM LINE NULL
from $12.97
View Product
Carquest Premium - Radiator cap (Part No. 10241)
Description
Manufactured to meet all OEM specifications. Designed to be easy to install and remove. Manufactured from high quality components with proper relief and vacuum valves. Quality tested to stand up to even the most demanding automotive cooling systems.

Product Features:
Maintains proper cooling system pressure
Easy installation and removal
100% tested to ensure proper pressure and longevity
Meets all OEM specifications

4.5

Read 3 review(s)

Review snapshot ® by PowerReviews

4.5

4.5

5

5

2021-10-17

5

5

Would buy it again.

Would buy it again.

Submitted 2021-10-17

By Rafael

From Undisclosed

Good replacement for OEM

Bottom Line NULL

Good replacement for OEM

By Rafael from Undisclosed

BOTTOM LINE NULL

5

5

2021-08-17

5

5

I would buy this again

I would buy this again

Submitted 2021-08-17

By Nicole

From Undisclosed

Good quality, great price

Bottom Line NULL

Good quality, great price

By Nicole from Undisclosed

BOTTOM LINE NULL

5

5

2021-08-09

5

5

Quick, easy online purchase and store pick up!

Quick, easy online purchase and store pick up!

Submitted 2021-08-09

By joanne

From Undisclosed

Great fit! No issues!

Bottom Line NULL

Great fit! No issues!

By joanne from Undisclosed

BOTTOM LINE NULL
from $14.79
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Carquest Premium - Radiator cap (Part No. 10242)
Description
Manufactured to meet all OEM specifications. Designed to be easy to install and remove. Manufactured from high quality components with proper relief and vacuum valves. Quality tested to stand up to even the most demanding automotive cooling systems.

Product Features:
Maintains proper cooling system pressure
Easy installation and removal
100% tested to ensure proper pressure and longevity
Meets all OEM specifications

4.0

Read 3 review(s)

Review snapshot ® by PowerReviews

4.0

4.0

2

2

2022-03-03

2

2

This thing is a bandaid

This thing is a bandaid

Submitted 2022-03-03

By DellSupport

From Nashville, TN

I did a drain and fill on a GX460. I went ahead and replaced the radiator cap with this thing just because. I ended up losing about a quarter inch of fluid per few hours of operation. I put some tracer fluid in the tank thinking I had an actual leak, and the pattern made no sense for a normal leak at all. Accepting that there were no visible leaks (that made any sense), and the only other changed input was the cap, I replaced this cap with a factory OEM cap from Lexus. Went on an 8 hour drive. No coolant loss. If you need a radiator cap, then yeah get it. But I would not use it as a long term solution. Else, you will be perpetually topping off your radiator fluid (For a Lexus GX460 at least).

Bottom Line not recommended

I did a drain and fill on a GX460. I went ahead and replaced the radiator cap with this thing just because. I ended up losing about a quarter inch of fluid per few hours of operation. I put some tracer fluid in the tank thinking I had an actual leak, and the pattern made no sense for a normal leak at all. Accepting that there were no visible leaks (that made any sense), and the only other changed input was the cap, I replaced this cap with a factory OEM cap from Lexus. Went on an 8 hour drive. No coolant loss. If you need a radiator cap, then yeah get it. But I would not use it as a long term solution. Else, you will be perpetually topping off your radiator fluid (For a Lexus GX460 at least).

By DellSupport from Nashville, TN

BOTTOM LINE not recommended

1

1

2021-12-20

1

1

No

No

Submitted 2021-12-20

By Jim the Rummer

From Asheville, NC

cap received is a differnt cap from picture - go to buy OEM from Rock Auto

Bottom Line not recommended

cap received is a differnt cap from picture - go to buy OEM from Rock Auto

By Jim the Rummer from Asheville, NC

BOTTOM LINE not recommended

5

5

2021-08-22

5

5

Perfect fit for 2002 Highlander

Perfect fit for 2002 Highlander

Submitted 2021-08-22

By Anibal

From Undisclosed

Fit like a glove

Bottom Line NULL

Fit like a glove

By Anibal from Undisclosed

BOTTOM LINE NULL
from $14.79
View Product
Carquest Premium - Safety Lever Radiator Cap (Part No. 10333)
Description
Safely remove your radiator cap by venting the pressure from the cooling system before removing the cap. Manufactured to meet all OEM specifications. Designed to be easy to install and remove. Manufactured from high quality components with proper relief and vacuum valves. Quality tested to stand up to even the most demanding automotive cooling systems.

Product Features:
Safety lever to vent coolant pressure before removal
Maintains proper cooling system pressure
Easy installation and removal
100% tested to ensure proper pressure and longevity
Meets all OEM specifications

4.0

Read 3 review(s)

Review snapshot ® by PowerReviews

4.0

4.0

5

5

2021-07-27

5

5

Would buy it again.

Would buy it again.

Submitted 2021-07-27

By Shelly

From Undisclosed

Works great.

Bottom Line NULL

Works great.

By Shelly from Undisclosed

BOTTOM LINE NULL

4

4

2021-05-17

4

4

does the job..

does the job..

Submitted 2021-05-17

By mark

From Undisclosed

better than good..

Bottom Line NULL

better than good..

By mark from Undisclosed

BOTTOM LINE NULL

1

1

2021-03-29

1

1

I don't recommend this radiator cap

I don't recommend this radiator cap

Submitted 2021-03-29

By Michael

From Undisclosed

I've had to return three of these within a year of buying them for failure to work as they should

Bottom Line NULL

I've had to return three of these within a year of buying them for failure to work as they should

By Michael from Undisclosed

BOTTOM LINE NULL
from $20.49
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Autopart International Inc - Radiator Cap (Part No. G10101936436API)

from $20.32
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Futaba FEW - Futaba / FEW Radiator Cap (Part No. G1010281394FUT)
Description
The Futaba radiator cap range has been developed to operate within original equipment manufacturer's specifications. A faulty radiator cap can cause your car to boil-over at a lower temperature. Test or replace the coolant cap when servicing the cooling system.

Product Features:
Meets Original Equipment specifications.
Made from premium materials.
Designed to function on open cooling systems and overflow reservoir type systems.
from $17.10
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Futaba FEW - Futaba / FEW Radiator Cap (Part No. G101045813FUT)
Description
The Futaba radiator cap range has been developed to operate within original equipment manufacturer's specifications. A faulty radiator cap can cause your car to boil-over at a lower temperature. Test or replace the coolant cap when servicing the cooling system.

Product Features:
Meets Original Equipment specifications.
Made from premium materials.
Designed to function on open cooling systems and overflow reservoir type systems.
from $16.70
View Product
Sankei Switches - Sankei Switches Radiator Cap (Part No. G1010281394SAK)
Description
The Sankei Switches radiator cap range has been developed to operate within original equipment manufacturer's specifications. A faulty radiator cap can cause your car to boil-over at a lower temperature. Test or replace the coolant cap when servicing the cooling system.

Product Features:
Meets Original Equipment specifications.
Made from premium materials.
Designed to function on open cooling systems and overflow reservoir type systems.
from $11.94
View Product