How to Service and Repair a Radiator Cap on Jeep Wrangler?

Servicing and fixing the radiator cap should be done only with mild soap and water, since solvents may damage the seal. Look at the cap from directly above and make sure the vent on the bottom opens properly. If the gasket is too large and blocks it, that means the cap needs replacing. After that, check at eye level with the cap upside down; if light is present where the vent valve and rubber gasket meet, replace the cap. Make sure the new cap you use does not have a spring to seal the vent shut by hand and that it is made for a coolant reserve/overflow system with a thoroughly sealed diaphragm spring and a rubber gasket that fits the radiator filler neck top.

How to Inspect and Replace a Radiator Cap on Jeep Wrangler?

Look at the bottom of the radiator cap while it is upright; the vent valve should open when you do so. In case the rubber gasket swells which stops the vent valve from working, you will have to replace the cap. Also, hold the cap upside down at the same level as your eyes, checking for any light between the vent valve and the rubber seal. If light is present, change the cap. Remember that a cap without a spring is recommended when fitting a vent connector. The replacement cap needs to fit with a coolant reserve/overflow system, using a fully sealed diaphragm spring and a gasket that joins the cap to the radiator filler neck's upper rim. Properly capped systems enable the coolant to be returned to the radiator.

OEM Jeep Wrangler Radiator Cap

Cooling Radiator Cap

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9 Radiator Caps found

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Jeep Wrangler Radiator Cap Part Number: 52079880AA
$15.68 MSRP: $22.95
You Save: $7.27 (32%)
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Product Specifications
- Other Name: Cap - Radiator; Cap; Cap Radiator
- Replaces: 4677493AA
- Warranty: This genuine part is guaranteed by Mopar's factory warranty.
Fits the following Vehicles:
- 1994-1995 Jeep Wrangler | Renegade, Rio Grande, S, SE, Sahara | 4 Cyl 2.5 L GAS, 6 Cyl 4.0 L GAS
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Jeep Wrangler Expansion Tank, Front Part Number: 68442532AA
$22.40 MSRP: $32.75
You Save: $10.35 (32%)
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Product Specifications
- Other Name: Cap - Coolant Recovery Bottle; Engine Coolant Reservoir Cap, Front; Engine Coolant Reservoir Cap; Radiator Cap; Reservoir Cap; Cap; Cap Coolant Recovery Bottle
- Position: Front
- Replaces: 68096261AA, 68249136AA
- Warranty: This genuine part is guaranteed by Mopar's factory warranty.
Fits the following Vehicles:
- 2018-2025 Jeep Wrangler | 80th Anniversary, Freedom, Islander, Rubicon, Rubicon X, Sport, Sport S, Unlimited 80th Anniversary, Unlimited Freedom, Unlimited High Altitude, Unlimited High Tide, Unlimited Islander, Unlimited Moab, Unlimited Rubicon, Unlimited Rubicon 392, Unlimited Rubicon X, Unlimited Sahara, Unlimited Sahara Altitude, Unlimited Sport, Unlimited Sport Altitude, Unlimited Sport S, Unlimited Willys, Unlimited Willys Sport, Willys, Willys Sport | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.6 L GAS, 6 Cyl 3.6 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 6.4 L GAS
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Jeep Wrangler Radiator Cap Part Number: 55116901AA
$18.13 MSRP: $23.35
You Save: $5.22 (23%)
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Product Specifications
- Other Name: Cap - Radiator; Engine Coolant Reservoir Cap; Reservoir Cap; Cap; Cap Radiator
- Replaces: 52079799AA
- Warranty: This genuine part is guaranteed by Mopar's factory warranty.
Fits the following Vehicles:
- 1997-2007 Jeep Wrangler | 65th Anniversary Edition, Rubicon, SE, Sahara, Sport, Unlimited, Unlimited Rubicon, Unlimited Sahara, Unlimited X, X | 2.4L L4, 2.5L L4, 4 Cyl 2.4 L GAS, 4 Cyl 2.5 L GAS, 4.0L L6, 6 Cyl 3.8 L GAS, 6 Cyl 4.0 L GAS
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Jeep Wrangler Radiator Cap Part Number: 4596198
$26.33 MSRP: $37.85
You Save: $11.52 (31%)
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Product Specifications
- Other Name: Cap - Radiator; Engine Coolant Reservoir Cap; Reservoir Cap; Recovery Tank Cap; Cap for Coolant Recovery Bottle; Radiator Cap 04596198
- Replaces: 5086226AA
- Warranty: This genuine part is guaranteed by Mopar's factory warranty.
Fits the following Vehicles:
- 2008-2017 Jeep Wrangler | 70th Anniversary, 75th Anniversary, Rubicon, Sahara, Sport, Sport S, Unlimited 70th Anniversary, Unlimited 75th Anniversary, Unlimited Rubicon, Unlimited Sahara, Unlimited Sport, Unlimited Sport S, Unlimited X, X, X-S | 6 Cyl 3.6 L GAS, 6 Cyl 3.8 L GAS
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Jeep Wrangler Reservoir Cap Part Number: 68490271AA
$14.59 MSRP: $21.40
You Save: $6.81 (32%)
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Product Specifications
- Other Name: Cap - Low Temperature Coolant Bot; Engine Coolant Reservoir Cap; Radiator Cap; Cap
- Warranty: This genuine part is guaranteed by Mopar's factory warranty.
Fits the following Vehicles:
- 2021-2025 Jeep Wrangler | Freedom, Rubicon, Rubicon X, Sport, Sport S, Unlimited Freedom, Unlimited High Altitude, Unlimited High Altitude 4xe, Unlimited Rubicon, Unlimited Rubicon 4xe, Unlimited Rubicon X, Unlimited Rubicon X 4xe, Unlimited Sahara, Unlimited Sahara 4xe, Unlimited Sahara Altitude, Unlimited Sport, Unlimited Sport Altitude, Unlimited Sport S, Unlimited Sport S 4xe, Unlimited Willys, Unlimited Willys 4xe, Unlimited Willys Sport, Willys, Willys Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
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Jeep Wrangler Reservoir Cap Part Number: 68388115AB
$15.95 MSRP: $22.95
You Save: $7.00 (31%)
Product Specifications
- Other Name: Cap - Coolant Recovery Bottle; Engine Coolant Reservoir Cap; Radiator Cap; Cap; Cap Coolant Recovery Bottle
- Replaces: 68388115AA
- Warranty: This genuine part is guaranteed by Mopar's factory warranty.
Fits the following Vehicles:
- 2018-2025 Jeep Wrangler | 80th Anniversary, Freedom, Islander, Rubicon, Rubicon X, Sport, Sport S, Unlimited 80th Anniversary, Unlimited Freedom, Unlimited High Altitude, Unlimited High Altitude 4xe, Unlimited Islander, Unlimited Rubicon, Unlimited Rubicon 4xe, Unlimited Rubicon X, Unlimited Rubicon X 4xe, Unlimited Sahara, Unlimited Sahara 4xe, Unlimited Sahara Altitude, Unlimited Sport, Unlimited Sport Altitude, Unlimited Sport S, Unlimited Sport S 4xe, Unlimited Willys, Unlimited Willys 4xe, Unlimited Willys Sport, Willys, Willys Sport | 2.0L L4, 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV), 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
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Jeep Wrangler Radiator Cap Part Number: J3239375
Product Specifications
- Other Name: Cap - Radiator; Cap, Radiator
- Warranty: This genuine part is guaranteed by Mopar's factory warranty.
Fits the following Vehicles:
- 1987-1993 Jeep Wrangler | Base, Islander, Laredo, Renegade, S, Sahara, Sport | 4 Cyl 2.5 L GAS, 6 Cyl 4.0 L GAS, 6 Cyl 4.2 L GAS
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Jeep Wrangler Expansion Tank Part Number: 68290247AA
$26.45 MSRP: $38.00
You Save: $11.55 (31%)
Product Specifications
- Other Name: Cap - Low Temperature Coolant Bot; Drive Motor Inverter Reservoir Cap; Engine Coolant Cap; Radiator Cap; Reservoir Cap; Cap; Cap Coolant Recovery Bottle
- Replaces: 68272801AA
- Warranty: This genuine part is guaranteed by Mopar's factory warranty.
Fits the following Vehicles:
- 2018-2023 Jeep Wrangler | 80th Anniversary, Freedom, Islander, Rubicon, Sport, Sport S, Unlimited 80th Anniversary, Unlimited Freedom, Unlimited High Altitude, Unlimited High Tide, Unlimited Islander, Unlimited Moab, Unlimited Rubicon, Unlimited Sahara, Unlimited Sahara Altitude, Unlimited Sport, Unlimited Sport Altitude, Unlimited Sport S, Unlimited Willys, Unlimited Willys Sport, Willys, Willys Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.6 L GAS, 6 Cyl 3.6 L MILD HYBRID EV-GAS (MHEV)
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Jeep Wrangler Radiator Cap Part Number: J3239375AB
Product Specifications
- Other Name: Cap - Radiator; Cap
- Warranty: This genuine part is guaranteed by Mopar's factory warranty.
Fits the following Vehicles:
- 1987-1993 Jeep Wrangler | Base, Islander, Laredo, Renegade, S, Sahara, Sport | 4 Cyl 2.5 L GAS, 6 Cyl 4.0 L GAS, 6 Cyl 4.2 L GAS

Jeep Wrangler Radiator Cap

Choose OEM Radiator Cap that meet Jeep factory standards. Jeep designs and tests every component for precision and durability. Each Radiator Cap follows strict manufacturing steps to lock in quality and fit. If your Jeep Wrangler matters to you, OEM parts make the smart choice. You'll get the exact look, feel, and performance you expect. Shop genuine Wrangler parts at the highly competitive prices online. Enjoy a manufacturer's warranty, a hassle-free return policy, and rapid delivery. No more guesswork with off brands. Get genuine parts with exact fit and true factory performance. Shop with confidence today at JeepPartsDeal.com.

Radiator Cap is one of the significant parts that strengthen the Jeep Wrangler's mechanism and its cooling system. Manufactured to guard the mouth of the radiator and to prevent the wastage of the fluid housed inside while at the same time regulating pressure, which is usually around 16 PSI, a Radiator Cap is an essential component that serves to also release supplementary coolant or gas when deemed necessary. In the course of years of Wrangler production, several versions of Radiators have used the Radiator Caps of different types which are made of different materials with specifically defined performance characteristics to meet the new achievements in the sphere of automobile cooling systems. This evolution better the overall efficiency and safety of the Jeep Wrangler making them ideal for ofteroad use as well as regular road use. Any Jeep owner - be it of the usual two-door Wrangler or the newer four-door Wrangler Unlimited - will find this vital part suitable for his rig. However, the Radiator Cap is unique concerning automotive products because of its sturdy build and right pressure control, which enhance the engine's durability. The design of this Radiator Cap also includes features that make its intended engine specs more significant, improving the Jeep Wrangler while also asserting the brand's durability and reliability. In conclusion, the Radiator Cap also shows the brand's focus on creating parts that are both effective and of high standard so that every Jeep Wrangler can work in its optimum safety level.

Jeep Wrangler Radiator Cap Parts and Q&A

Radiator Cap
55116901AA
Q: How to Service and Repair a Radiator Cap on Jeep Wrangler?
A:
Servicing and fixing the radiator cap should be done only with mild soap and water, since solvents may damage the seal. Look at the cap from directly above and make sure the vent on the bottom opens properly. If the gasket is too large and blocks it, that means the cap needs replacing. After that, check at eye level with the cap upside down; if light is present where the vent valve and rubber gasket meet, replace the cap. Make sure the new cap you use does not have a spring to seal the vent shut by hand and that it is made for a coolant reserve/overflow system with a thoroughly sealed diaphragm spring and a rubber gasket that fits the radiator filler neck top.
Radiator Cap
4596198
Q: How to Inspect and Replace a Radiator Cap on Jeep Wrangler?
A:
Look at the bottom of the radiator cap while it is upright; the vent valve should open when you do so. In case the rubber gasket swells which stops the vent valve from working, you will have to replace the cap. Also, hold the cap upside down at the same level as your eyes, checking for any light between the vent valve and the rubber seal. If light is present, change the cap. Remember that a cap without a spring is recommended when fitting a vent connector. The replacement cap needs to fit with a coolant reserve/overflow system, using a fully sealed diaphragm spring and a gasket that joins the cap to the radiator filler neck's upper rim. Properly capped systems enable the coolant to be returned to the radiator.