Best Replacement Coolant Caps: 10 Durable, Affordable Picks

1. 2PCS Engine Radiator Coolant Water Tank Black Reservoir Cap, Compatible with Infiniti Nissan Renault, OEM# 21712-79900

Get 2PCS Engine Radiator Coolant Water Tank Black Reservoir Caps with OEM# 21712-79900 for Infiniti Nissan Renault vehicles. They resist high temperatures and last a long time.

The caps measure about 1.5 x 1.5 inch outer and 1.2 x 1.2 inch inner. Two caps are included for easy replacement. Contact us if you need help.

2. Car Radiator Cap Replacement OEM#68442532aa,53479332,Coolant Reservoir Cap Compatible with Chrysler Dodge Jeep Ram,Standard Car Accessories Radiator Cover Easy to Mounting

This is a direct replacement coolant reservoir cap for Chrysler, Dodge, Jeep and Ram cars. It matches exact OEM part numbers 68442532AA, 53479332, 68249136AA for a perfect fit.
It is made of strong, wear-resistant nylon material that holds up to daily use. The gear-shaped non-slip edge makes it easy to grip and twist.
It installs in seconds. Unscrew the old cap. The raised bottom seals tightly.

3. 17117639020 17117521071 Radiator Expansion Tank Cap, Coolant Reservoir Cap

This BMW radiator expansion tank cap is a key part of your car’s cooling system. It fits many 2008 to 2025 BMW models, including the 3 Series, X5, and M3.
Swap out your old cap if you notice coolant leaks, engine overheating, or bad cooling system pressure. It is a direct replacement for part numbers 17117639020 and 17117521071, made with durable, high-quality materials.
This is an aftermarket part, not a genuine BMW piece. All caps pass strict quality checks. Contact us if you have any questions.

4. Dorman 54201 Engine Coolant Reservoir Cap

The Dorman 54201 is a direct replacement for a broken coolant reservoir cap. It works just like your car’s original cap. It fits specific car makes, models, and years.
It is reverse-engineered from original equipment for a perfect fit. Replacing it is quick and easy. It costs less than the same part at the dealership.
Use the garage tool to enter your car’s make, model, and trim to check fit. This excellent value part keeps your engine cooling system working well.

5. GM Genuine Parts RC122 (85604317) Coolant Recovery Reservoir Cap

GM Genuine Parts RC122 (85604317) Coolant Recovery Reservoir Cap fits your GM vehicle. It stops coolant from spilling out of your engine’s recovery tank. It keeps your engine coolant pressure at the correct level.
This part used to be sold as ACDelco GM Original Equipment. It is designed, tested and backed by General Motors.
GM engineers make this part specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle. GM updates its part designs to use new materials and tech.

6. Dorman 54245 Engine Coolant Cap

The Dorman 54245 Engine Coolant Cap is a direct replacement for cracked or lost original reservoir caps. It is an application specific part made to fit your vehicle’s exact coolant cap. Enter your make, model and trim in the garage tool to confirm it fits your car.
It is a quick, easy excellent value option that costs less than a dealership replacement. It has a seamless fit because it is reverse-engineered from the original part to work perfectly.

7. Car Coolant Reservoir Cap Replacement OEM 17117521071,Essential Car Radiator Cap Compatible with BMW M340i X1 M235i X6 440i,Professional Cars Coolant Caps Replacement

This is the OEM 17117521071 car coolant reservoir cap replacement for BMWs. It fits common models like the M340i, X1, M235i, X6 and 440i across many production years.
It has a heat-resistant gasket for tight sealing. The durable plastic handles high heat and pressure. It stops coolant leaks and spills safely.

8. Coolant Reservoir Cap for Chevy GMC Buick Silverado 1500 2500 3500 Express

This Coolant Reservoir Cap works for lots of cars and trucks. Every cap is fully tested before shipping. It fits Chevy, GMC, Buick, Silverado, Express and many other models.
Check the dropdown list to make sure it fits your vehicle. It replaces your old broken or leaking reservoir cap.

9. 2 Pack Engine Coolant Reservoir Cap, Yellow Coolant Cap Compatible with Chrysler, Dodge, Jeep, Ram, Replacements 55111074AA, 55111074AB, 52079331, 54201

This 2 pack of yellow engine coolant reservoir caps fits most Chrysler, Dodge, Jeep, and Ram models. They replace common OEM part numbers including 55111074AA, 55111074AB, and 52079331.
These caps are made of durable rust-proof ABS material that won’t bend or fade. The bright yellow color and raised coolant markings make them easy to spot fast. They snap on in seconds with no tools needed.
Always double check your vehicle’s OEM part number before ordering to confirm fit. These direct replacement caps deliver long lasting, reliable performance.

10. Dorman 54211 Coolant Reservoir Cap

The Dorman 54211 Coolant Reservoir Cap is a direct replacement for your vehicle’s cracked or lost cap. It’s made to fit specific makes and models perfectly. This cap ensures your coolant system stays sealed and works well.

It’s reverse-engineered from the original part for a seamless fit. Plus, it’s less expensive than buying from a dealership.

Using this cap is quick and easy. Just check your vehicle’s fit with the garage tool. It’s a smart, cost-effective choice for your car.