Radiator Caps

The radiator cap is a small but important component of your vehicle’s cooling system. When functioning properly, the cap keeps contaminates and excess air out of your...

The radiator cap is a small but important component of your vehicle’s cooling system. When functioning properly, the cap keeps contaminates and excess air out of your cooling system. Excess air in the system reduces cooling efficiency and can lead to problems like engine overheating.

Most radiator caps for modern applications are designed to let a specified amount of pressure build in the system as the coolant heats up and expands. If the system’s pressure exceeds the specified radiator cap pressure, a valve in the cap opens to let coolant flow into the coolant reservoir. As the coolant temperature decreases and the system pressure drops, the cap allows the coolant to return to the main cooling system. For added safety, some caps come equipped with pressure-release levers to vent excess pressure before the cap is removed.

If you’re experiencing cooling problems, you may want to start with a new radiator cap. We have you covered with a wide selection of stock replacement radiator caps for just about anything you drive. We also carry radiator caps with built-in temperature gauges so you know just what’s happening inside your cooling system. When it’s time to upgrade to an aftermarket aluminum radiator, top it off with a billet aluminum radiator cap in a variety of eye-catching finishes such as natural, chrome, polished, and anodized colors to complement your engine bay.

You can shop radiator caps with pressure ratings from 0 to 42 psi in a variety of styles from trusted brands like Stant, Moroso, Be Cool, Meziere, and more. And remember, everything we sell is backed by the best customer service in the industry.

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Results 1 - 25 of 413

Billet Specialties Radiator Caps 75120

Radiator Cap, Aluminum, Polished, Round, 16 psi, Each

Part Number: BSP-75120

4.86 out of 5 stars ( 49 )

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Summit Racing™ Radiator Caps SUM-380170

Radiator Cap, Steel, Natural, 16 psi, Release Lever, Vent, Each

Part Number: SUM-380170

5.0 out of 5 stars ( 5 )

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Moroso Racing Radiator Caps 63320

Radiator Cap, Steel, Hexagon, Moroso Logo, 19-21 psi, Each

Part Number: MOR-63320

5.0 out of 5 stars ( 9 )

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Billet Specialties Notch Grip Radiator Caps BLK75125

Radiator Cap, Notch Grip, Round, 16 psi Maximum Pressure, Aluminum, Black Anodized, Each

Part Number: BSP-BLK75125

4.55 out of 5 stars ( 11 )

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Moroso Racing Radiator Caps 63324

Radiator Cap, Steel, Hexagon, Moroso Logo, 23-25 psi, Each

Part Number: MOR-63324

5.0 out of 5 stars ( 7 )

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Billet Specialties Notch Grip Radiator Caps 75125

Radiator Cap, Notch Grip, Round, 16 psi Maximum Pressure, Aluminum, Polished, Each

Part Number: BSP-75125

4.68 out of 5 stars ( 41 )

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Billet Specialties Radiator Caps BLK75120

Radiator Cap, Billet Aluminum, Black Anodized, Round, Plain, 16 psi, Each

Part Number: BSP-BLK75120

4.33 out of 5 stars ( 15 )

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Griffin Radiator Caps KM-84

Radiator Cap, Aluminum, Silver Anodized, Hexagon, 17 psi, Each

Part Number: GRI-KM84

3.76 out of 5 stars ( 33 )

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Moroso Racing Radiator Caps 63316

Radiator Cap, Steel, Hexagon, Moroso Logo, 14-18 psi, Each

Part Number: MOR-63316

5.0 out of 5 stars ( 2 )

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Moroso Racing Radiator Caps 63332

Radiator Cap, Steel, Hexagon, Moroso Logo, 31-33 psi, Each

Part Number: MOR-63332

5.0 out of 5 stars ( 2 )

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Meziere Radiator Caps WCC301

Radiator Cap, Safecap, Billet Aluminum, Black Anodized, Round, 16 psi, Each

Part Number: MEZ-WCC301

5.0 out of 5 stars ( 3 )

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Summit Racing™ Radiator Caps SUM-380160

Radiator Cap, 16 psi, Round, Summit Logo, Polished, Knurled O.D., Each

Part Number: SUM-380160

4.71 out of 5 stars ( 49 )

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Meziere Radiator Caps WCC307

Radiator Cap, Safecap, Billet Aluminum, Black Anodized, 25 psi, Each

Part Number: MEZ-WCC307

5.0 out of 5 stars ( 1 )

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ACDelco Radiator Caps 10409635

Radiator Cap, Steel, Natural, Standard, Street, 15 psi, Each

Part Number: ADO-RC27

4.94 out of 5 stars ( 31 )

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Billet Specialties Radiator Caps 75320

Radiator Cap, Aluminum, Polished, Round, Bowtie Emblem, 16 psi, Each

Part Number: BSP-75320

4.88 out of 5 stars ( 64 )

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MotoRad Lev-R-Vent Radiator Caps ST16V

Radiator Cap, Lev-R-Vent, Stainless Steel, Natural, Stant, 16 psi, Buick, Chevy, Chrysler, Dodge, GMC, Each

Part Number: SNN-ST16V

5.0 out of 5 stars ( 2 )

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Summit Racing™ Radiator Caps SUM-380171

Radiator Cap, Steel, Natural, 16 psi, Each

Part Number: SUM-380171

4.78 out of 5 stars ( 9 )

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Mr. Gasket Thermocap Radiator Caps 2471S

Radiator Cap/Gauge, Thermocap, Aluminum, Silver Anodized, Plain, 16 psi, 30-270 Degrees F, Each

Part Number: MRG-2471S

3.45 out of 5 stars ( 47 )

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Moroso Racing Radiator Caps 63328

Radiator Cap, Steel, Hexagon, Moroso Logo, 27-29 psi, Each

Part Number: MOR-63328

4.5 out of 5 stars ( 2 )

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DeWitts Engraved Radiator Caps 32-516B

Radiator Cap, 15 psi, Round, DeWitts Logo, Black Powdercoated, Posi-grip O.D., Each

Part Number: DWR-32-516B

3.0 out of 5 stars ( 1 )

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Be Cool Radiator Caps 70001

Be Cool Radiator Caps 70001

Radiator Cap, Aluminum, Natural, Round, Be Cool Logo, 13 psi, Each

Part Number: BCI-70001

4.3 out of 5 stars ( 10 )

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Summit Racing™ Radiator Caps SUM-380172

Radiator Cap, Steel, Natural, 13 psi, Release Lever, Vent, Each

Part Number: SUM-380172

5.0 out of 5 stars ( 4 )

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MotoRad Radiator Caps T16

Radiator Cap, Stainless Steel, Natural, Stant, 16 psi, Chevy, Chrysler, Dodge, Jeep, Ram, Each

Part Number: SNN-T16

5.0 out of 5 stars ( 1 )

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MotoRad Lev-R-Vent Radiator Caps ST18

Radiator Cap, Lev-R-Vent, Stainless Steel, Natural, Stant, 18 psi, Cadillac, Chevy, Chrysler, Dodge, Jeep, Pontiac, Each

Part Number: SNN-ST18

Not Yet Reviewed

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Mr. Gasket Thermocap Radiator Caps 2476BK

Radiator Cap/Gauge, Thermocap, Aluminum, Black Anodized, Plain, 16 psi, 30-270 Degrees F, Each

Part Number: MRG-2476BK

3.33 out of 5 stars ( 6 )

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