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The Best Radiator Reservoir Cap of 2023 – Reviewed and Top Rated

After hours researching and comparing all models on the market, we find out the Best Radiator Reservoir Cap of 2023. Check our ranking below.

2,286 Reviews Scanned

SaleRank No. #1

Dorman 54201 Engine Coolant Reservoir Cap Compatible with Select Models

Direct replacement - this engine coolant reservoir cap directly replaces a cracked or lost original cap
Application specific - made to match dimensions of reservoir cap on only certain vehicle years, makes and models
Seamless fit - reverse-engineered from the original equipment to fit perfectly
Excellent value - a quick, easy replacement that's less expensive than going back to the dealership
Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool

SaleRank No. #2

Dorman 54227 Engine Coolant Cap Compatible with Select Acura/Honda Models

Direct replacement - this engine coolant reservoir cap directly replaces a cracked or lost original cap
Application specific - made to match dimensions of reservoir cap on only certain vehicle years, makes and models
Seamless fit - reverse-engineered from the original equipment to fit perfectly
Excellent value - a quick, easy replacement that's less expensive than going back to the dealership
Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool

Rank No. #3

XQSMWF Radiator Coolant Reservoir Overflow Expansion Tank Cap with Joint Compatible with Honda Accord Acura Civic Pilot CR-V Replace Part Number 19102-PM5-A00 19102PM5A00 58910AD030B0

Replace Part Number:19102-PM5-A00, 19102PM5A00, 58910AD030B0.
Fitment:Compatible with Honda:for Civic 1990-1991 2006-2011,for Insight 2000-2006,for CR-V 1997-2001,for Accord 1997-2015,for Pilot 2003-2008,for Element 2003-2011,for Accord Crosstour 2011-2015.Fitment:Compatible with Honda:for Acura Legend 1991-1992,for Acura RL 1996-2004,for Acura ZDX 2010-2013,for Acura CL 1997-1999,for Acura TL 1997-2014,for Acura TSX 2004-2015,for Acura CL 2001-2003,for Acura MDX 2001-2006,for Acura Ridgeline 2006-2015,for Acura RDX 2013-2015.
Product specifications and models can perfectly meet your needs. You can use our products with confidence.Cost saving: excellent product quality, more economical price.
Time-saving: We will provide technical guidance, allowing you to complete the car repair and maintenance at home, without the need to go to a professional repair shop, saving you time.
After-sales service: XQSMWF will provide you with product return service. After you confirm that the product has quality problems, we will provide you with free return and exchange services.

SaleRank No. #4

Dorman 54245 Engine Coolant Cap Compatible with Select Nissan Models

Direct replacement - this engine coolant reservoir cap directly replaces a cracked or lost original cap
Application specific - made to match dimensions of reservoir cap on only certain vehicle years, makes and models
Seamless fit - reverse-engineered from the original equipment to fit perfectly
Excellent value - a quick, easy replacement that's less expensive than going back to the dealership
Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool

Rank No. #5

ACROPIX Radiator Coolant Reservoir Overflow Tank Cap for Honda Accord - Pack of 1 White

Fitment: for Acura CL 1997-2003, for Acura Legend 1991 -2001, for Acura MDX 2001-2006, for Acura RDX 2016-2018, for Acura RL 1996-2004, for Acura RLX 2016-2020, for Acura TL 1997-2014, for Acura TSX 2004-2014, for Acura ZDX 2010-2013, for Honda Accord 1995-2004 2006-2017, for Honda Accord Hybrid 2006-2007 2014-2015, for Honda CR-V 1997-2001, for Honda CRX 1990-1991, for Honda Civic 1990-1991, for Honda Crosstour 2010-2015, for Honda Del Sol 1995-1997, for Honda Element 2003-2010
FIt for Honda Insight 2000-2006, for Honda Odyssey 1996-2004, for Honda Pilot 2003-2008, for Honda Prelude 1998-2001, for Honda Ridgeline 2006-2014, for Honda S2000 2000-2009
Good Replacement - to replace the leaky/disintegrated/cracked cap, barb end fits snug on return hose of the coolant reservoir tank
Easy Installation - take a minute to disconnect old broken parts and install the new cap
OE Number: 19102-PM5-A00, 19102PM5A00

Rank No. #6

Dorman 54208 Coolant Reservoir Cap Compatible with Select Ford / Lincoln / Mercury Models

Direct replacement - this engine coolant reservoir cap directly replaces a cracked or lost original cap
Application specific - made to match dimensions of reservoir cap on only certain vehicle years, makes and models
Seamless fit - reverse-engineered from the original equipment to fit perfectly
Excellent value - a quick, easy replacement that's less expensive than going back to the dealership
Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool

Rank No. #7

Toyota 16405-0P030 Tank Cap Sub Assembly

Direct Fit
Genuine OEM Factory Original part
Guaranteed against poor workmanship and material defects
Japan

Rank No. #8

NewYall Radiator Coolant Reservoir Overflow Tank Cap w/Joint

Fits: Acura 2013-2015 RDX,2006-2015 Acura Ridgeline,2004-2015 Acura TSX,2010-2013 Acura ZDX,1997-2014 Acura TL,1991-1992 Acura Legend,1996-2004 Acura RL,1997-1999 Acura CL,2001-2003 Acura CL,2001-2006 Acura MDX
Fits: Honda 1997-2001 CR-V,2011-2015 Accord Crosstour,1997-2015 Accord,2006-2011 Civic,1990-1991 Civic,2000-2006 Insight,2003-2008 Pilot,2003-2011 Element

Rank No. #9

ACDelco GM Original Equipment RC98 15 P.S.I. Radiator Surge Tank Cap

Leading Manufacturer Of High-Quality Products
International Renown For Our Diverse Range Of Award-Winning Products
Fully Equipped With State-Of-The-Art Technology
All Products Have Been Designed With The Professional In Mind
Constantly Modernizing Our Powerful Devices To Meet The Demands Of The Modern User

SaleRank No. #10

Frienda 2 Pcss Coolant Reservoir Cap 21712-79900 Black Radiator Overflow Tank Lid Cap Radiator Liquid Storage Cover Compatible with Infiniti Nissan Renault Engine Radiator Water Tank Caps Coolant Caps

Compatibility information: these 21712-79900 coolant caps are compatible with Infiniti Nissan Renault engine radiator water tanks, please check the size information and compatibility carefully before placing an order
Reliable material: these radiator overflow tank caps are made of quality plastic material, sturdy and tough, solid and firm, not easy to break or deform, offering a long service life, which can help you maintain your delicate car
Suitable size: the model number of the black coolant reservoir cap is 21712-79900, the out diameter is about 1.5 x 1.5 inch/ 3.81 x 3.81 cm, inner diameter is about 1.2 x 1.2 inch/ 3.05 x 3.05 cm, and the height is about 0.43 inch/ 1.1 cm, which is the ideal size for many types of cars, compact and lightweight, easy to carry and store in a small tool box without occupying much space
Practical function: the engine radiator water tank cap is designed to prevent the liquid in the coolant storage tank from flowing out, so that the liquid will not spill out easily during the driving process, which can ensure that you can get a pleasant and relaxing driving experience
Package content: you will receive 2 pieces of plastic coolant tank caps, coming in black color, enough to meet your daily use and replacement, you can store them for a long-term use, or share them with your friends and families who have cars

Rank No. #11

Motorcraft - Cap Asy - Radiator (P) (RS527)

Leading Manufacturer Of High-Quality Products
International Renown For Our Diverse Range Of Award-Winning Products
Fully Equipped With State-Of-The-Art Technology
All Products Have Been Designed With The Professional In Mind
Constantly Modernizing Our Powerful Devices To Meet The Demands Of The Modern User

SaleRank No. #12

ACROPIX Radiator Coolant Reservoir Overflow Tank Cap for Acura RDX - Pack of 1 White

Fitment: for Honda Civic 1990-1991 2006-2011, for Honda CR-V 1997-2000, for Honda Accord 1997-2005, for Honda Insight 2000-2006, for Honda Pilot 2003-2008, for Honda Element 2003-2011, for Honda Accord Crosstour 2011-2015, for Acura Legend 1991-1992, for Acura RL 1996-2004, for Acura CL 1997-1999 2001-2003, for Acura TL 1997-2014, for Acura CL 2000-2003, for Acura MDX 2001-2006, for Acura TSX 2004-2015, for Honda Ridgeline 2006-2015, for Acura ZDX 2010-2013, for Acura RDX 2003-2015
OE Number: 19106-RNA-A48, 906-RNA-A48
Good Replacement - to replace the leaky/disintegrated/cracked cap, barb end fits snug on return hose of the coolant reservoir tank
Easy Installation - take a minute to disconnect old broken parts and install the new cap
Package Includes: 1 pcs Reservoir Overflow Tank Cap

Rank No. #13

Dorman 54218 Coolant Reservoir Cap Compatible with Select Models

Direct replacement - this engine coolant reservoir cap directly replaces a cracked or lost original cap
Application specific - made to match dimensions of reservoir cap on only certain vehicle years, makes and models
Seamless fit - reverse-engineered from the original equipment to fit perfectly
Excellent value - a quick, easy replacement that's less expensive than going back to the dealership
Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool

SaleRank No. #14

ACDelco GM Original Equipment 13502353 20 P.S.I. Radiator Surge Tank Cap

Leading Manufacturer Of High-Quality Products
International Renown For Our Diverse Range Of Award-Winning Products
Fully Equipped With State-Of-The-Art Technology
All Products Have Been Designed With The Professional In Mind
Constantly Modernizing Our Powerful Devices To Meet The Demands Of The Modern User

Rank No. #15

2 PCS Radiator Coolant Reservoir Overflow Tank Cap with Joint, Coolant Reservoir Cap Fit for Honda Acura Accord Civic Pilot Insight Element, Replacement #19102-PM5-A00

[High quality material]: Coolant reservoir cap is made of high quality abs, light weight, not easy to break and deformation, with good wear resistance, corrosion resistance, long service life.
[Replace part number]: Replacemengt OE#19102-PM5-A00,Please confirm your OEM model before purchase to ensure Coolant Reservoir Cap is suitable for your car.
[Compatible 1]： Coolant Reservoir Cap Compatible with Acura 2013-2015 Acura RDX,2006-2015 Acura Ridgeline,2004-2015 Acura TSX,2010-2013 Acura ZDX,1997-2014 Acura TL,1991-1992 Acura Legend,1996-2004 Acura RL,1997-1999 Acura CL,2001-2003 Acura CL,2001-2006 Acura MDX.
[Compatible 2]：Coolant Reserve Cap Compatible with Honda 1997-2001 CR-V,2011-2015 Accord Crosstour,1997-2015 Accord,2006-2011 Civic,1990-1991 Civic,2000-2006 Insight,2003-2008 Pilot,2003-2011 Element.
[Radiator Caps]：The white radiator cap can well seal the liquid in the coolant reservoir, reduce the risk of liquid leakage, and meet your replacement and use needs in daily life.

SaleRank No. #16

ACDelco GM Original Equipment 15060681 Engine Coolant Recovery Tank Cap, Black

Keeps coolant from flowing out of the engine coolant recovery tank to maintain the proper engine temperature
GM-recommended replacement part for your GM vehicle’s original factory component
Offering the quality, reliability, and durability of GM OE
Manufactured to GM OE specification for fit, form, and function

Rank No. #17

Dorman 54370 Engine Coolant Reservoir Cap for Select Honda Models

Direct replacement - this engine coolant reservoir cap directly replaces a cracked or lost original cap
Application specific - made to match dimensions of reservoir cap on only certain vehicle years, makes and models
Seamless fit - reverse-engineered from the original equipment to fit perfectly
Excellent value - a quick, easy replacement that's less expensive than going back to the dealership
Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool

Rank No. #18

Dreyoo 2 Pack Engine Coolant Reservoir Cap, Coolant Cap Replacement, Engine Recovery Overflow Tank Cap Compatible with Chrysler/Dodge/Jeep/Ram 55111074AA 52079331

Wide Compatibility: the coolant tank overflow bottle cap is compatible with 55111074AA, 55111074AB, 55038011AB, 55116874AE, 52079331, 54201 part number; Radiator cap is compatible with Jeep TJ/XJ/KJ/WJ most model engines, compatible with Dodge most model engines, compatible with Chrysler most model engines, compatible with Ram C/V (2012-2015) engines
Sturdy Material: the coolant recovery bottle cap is made of ABS material, which is hard and the internal structure is stable, so the brake fluid cap is not easy to deform and fade; The radiator cover has high durability, long service life, is not easy to break, and has good impact, scratch, and wear resistance
Specifications: this coolant bottle cap is designed as direct replacement for old or broken ones, which can suit your needs; To fit make sure the flat edge is aligned with the retaining lip on the reservoir to ensure it snaps into place; It only takes a few seconds to install
Good Replacement Set: the coolant recovery cap has an integral snap design that helps to keep the coolant in the reservoir when fastened; No coolant leaks and no more smelling radiator fluid when sitting in the car; The coolant tank overflow bottle cap is ideal for replacing old coolant recovery caps
Bright Yellow Radiator Cap: for those who do not know much about the structure of the car, designed the radiator cap in a bright yellow color and the three dimensional coolant markings, so that you can tell where the coolant is and replace it at a glance, without fear of confusion with the glass water cap

Rank No. #19

MotoRad T-64 Radiator Cap

Manufactured from high quality components with proper relief and vacuum valves
Designed to be easy to install and remove
Manufactured to meet all OEM specifications
Quality tested to stand up to demands of the automotive cooling system
Fit type: Vehicle Specific

Rank No. #20

Radiator Coolant Recovery Cap, Replace 68442532AA Compatible with Chrysler Dodge Jeep Ram EcoDiesel - 2014-2021 Cherokee Ram 1500, 2017-2021 Pacifica Compass, 2016-2021 Durango Grand Cherokee, More

REPLACEMENT RADIATOR COOLANT RECOVERY CAP : The radiator cap holds the coolant inside the radiator, but it also works as a two-way valve that keeps the right pressure inside so the radiator does it work correctly. If the pressure isn't maintained, the coolant can boil and evaporate, putting the engine at risk of overheating. Symptoms of a Bad Radiator Cap: air enters the system, low coolant level, coolant leaks, overflowing reservoir, overheating engine.
COMPATIBLE WITH CHRYSLER, DODGE & JEEP VEHICLES : 2015, 2016, 2017 200 | 2017, 2018, 2019, 2020, 2021 Pacifica | 2020, 2021 Voyager | 2013, 2014, 2015, 2016 Dart | 2016, 2017, 2018, 2019, 2020, 2021 Durango | 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Cherokee | 2017, 2018, 2019, 2020, 2021 Compass | 2020, 2021 Gladiator | 2016, 2017, 2018, 2019, 2020, 2021 Grand Cherokee | 2018, 2019, 2020, 2021 Wrangler radiator coolant recovery cap.
REPLACES PART # : 68442532AA radiator coolant recovery cap. The coolant recovery cap can compatible with Jeep, Ram EcoDiesel : 2015, 2016, 2017, 2018, 2019, 2020, 2021 Renegade | 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ram 1500 | 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ram 2500 | 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ram 3500 | 2019 Ram 1500 Classic. Please check the detailed description before purchase. Thank you!
OE FIT, FORM, FUNCTION : Professional, high quality OE style and meet or exceed all original equipment performance replacement radiator cap. Constructed with premium materials for durability. Designed to function on open cooling systems and overflow reservoir type systems and allows the cap to be installed and removed much easier. Once you have a replacement and your engine is cool, simply unscrew the old cap, and install the new by screwing it on.
FRIENDLY NOTE : If the Radiator Coolant Recovery Cap fails on your vehicle, simply contact us for a replacement. Also if you have any other questions on our this 21 P.S.I. coolant recovery cap, please contact us at the first time. This is NOT a genuine part, it's a aftermarket replacement part manufactured by Allmotorparts and can fixed your antifreeze lose problem very well.

Last update on 2023-08-08 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

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FAQ:

Q: What are the functions of the radiator cap?

A: A radiator pressure cap keeps the system pressure at 16 PSI,which avoids the coolant from boiling off even when it gets hotter considerably. Because liquid expands as it gets hotter,the pressure cap allows coolant to escape to a reservoir tank when it expands. … The radiator pressure cap prevents trapping of air in the cooling system. …

Q: Do I add coolant to the radiator or the reservoir?

A: If the coolant level is low, add the correct coolant to the reservoir (not the radiator itself). You can use diluted coolant by itself, or a 50/50 mixture of concentrated coolant and distilled water. When the coolant rises to the cold fill line, replace the cap and tighten it until you feel it click. Close the hood.

Q: Why is the radiator cap so important?

A: The reason is that the job of the radiator cap is to keep coolant stored and pressurized in the radiator system. Don’t forget that 16 psi (pounds per square inch of pressure) exists inside the radiator. The radiator cap is what manages this pressure and keeps it consistent.

Q: Why is the radiator coolant filling up the reservoir?

A: The radiator cap is like the air release system of a pressure cooker. When the radiator is hot, pressure builds up inside it, which releases some of the coolant from the cap. This overflowing coolant passes into the reservoir where it is stored until the engine cools.