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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...
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.
Showing In Stock Items. Show All 54 Items.
Moroso Racing Radiator Caps
These high-pressure Moroso caps fit standard-size radiator filler necks and increase the boiling point to improve heat transfer. They have a solid brass spring retainer and a stainless steel spring that maintain an accurate pressure setting over time and will not rust.
( 39 )
$20.19
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$24.99
Billet Specialties Radiator Caps
Billet Specialties billet dome-style radiator caps are designed with knurled grip sides for easy removal, and a nice polished finish to dress up your radiator. They come in a variety of styles.
( 175 )
$35.95
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$39.95
Billet Specialties Notch Grip Radiator Caps
Billet Specialties notch radiator caps are the perfect complements to your new radiator, power steering reservoir, or overflow tank. They are made out of aluminum and have two different finishes. These Billet Specialties notch radiator caps are a great way to make what you have under the hood look show-quality.
( 53 )
$44.95
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$50.80
Griffin Radiator Caps
These Griffin radiator caps are precision-machined and are made for years of use. They come in a variety of pressure ratings and styles for various needs.
( 46 )
$48.00
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$74.00
Summit Racing™ Radiator Caps
Summit Racing™ offers replacement radiator caps for a variety of applications. These recovery-style caps feature a heavy-duty design built to handle the pressures of street/strip use. They're compatible with many engine designations, and are available in pressure ranges up to 26 psi. Order the cap preferred for your engine bay.
( 91 )
$5.99
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$35.99
Meziere Radiator Caps
Meziere radiator caps are a stylish finishing touch to your coolant system. They're available in a variety of materials, finishes, edge shapes, and logo designs. Choose the cap you prefer for looks—and for the maximum pressure seal needed on your radiator application.
( 6 )
$114.84
MotoRad Lev-R-Vent Radiator Caps
Improve your safety quotient with these Lev-R-Vent radiator caps from MotoRad. Lev-R-Vent radiator caps feature a unique pressure release lever that vents pressure prior to removing the caps, reducing the risk of injury. These caps are designed to easily fit in the smaller spaces of today's engines.
( 13 )
$3.99
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$9.99
ACDelco Radiator Caps
ACDelco radiator caps help restore cooling performance with the proper fit, form, and function for your vehicle. They feature high-quality materials and strict design requirements that match OE specifications—critical to ensuring an easy installation and dependable operation. The replacement caps are available in dozens of styles and options. Order the model recommended for your application.
( 63 )
$1.50
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$13.99
On Sale
Mr. Gasket Thermocap Radiator Caps
These Mr. Gasket Thermocap radiator caps combine a high-pressure radiator cap with a thermometer element; just check the integrated temperature gauge, and you will know when it is safe to remove the cap. They are manufactured from aluminum and are available in your choice of red, blue, or silver anodized finishes. The Mr. Gasket Thermocap radiator caps read temperature in both Fahrenheit and Celsius to suit any vehicle's needs. No tools or modifications are required; just remove your old stock cap and replace it with one of the new Thermocaps. No more guessing games about whether or not it is safe to remove the radiator cap--with one of these Mr. Gasket Thermocap radiator caps, you will be safe each and every time.
( 99 )
$55.29
$36.85
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$56.69
Be Cool Radiator Caps
Add the finishing touch to your cooling system with one of Be Cool's radiator caps. The caps are available in multiple styles, with either a polished or satin finish, and feature the Be Cool logo. These caps are a great way to top off a Be Cool radiator.
( 40 )
$24.99
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$66.99
MotoRad Radiator Caps
MotoRad products offers a wide variety of radiator caps for domestic and import cars, heavy-duty and light trucks, racing, off-road, and agricultural applications. MotoRad offers standard on radiator caps, as well as caps for coolant recovery tanks. Whatever your cooling needs are, you can count on MotoRad for the right products.
( 8 )
$3.99
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$11.99
Mishimoto High-Pressure Radiator Caps
Mishimoto radiator caps are a cool idea! Replacing the radiator cap in your import or domestic ride with Mishimoto high-pressure caps is smart. OEM caps can't handle the higher pressure of your cooling system when faced with hard driving conditions. Rated at 19 lbs. of pressure, these caps are available in sizes and styles to fit your vehicle. Mishimoto offers their standard high-pressure caps, carbon fiber caps to enhance the looks of your engine bay, and temperature gauge caps to view an accurate temperature reading of your coolant! All have the Mishimoto logo. So, keep your coolant where it needs to be--flowing within your system!
( 7 )
$25.95
Canton Racing Radiator Caps
Canton Racing radiator caps are designed for use with their aluminum expansion tanks or any other application that requires a high-pressure radiator-style cap.
( 8 )
$12.00
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$62.00
DeWitts Engraved Radiator Caps
Close off your radiator in style with DeWitts engraved radiator caps. They are manufactured from high-quality aluminum and are available in your choice of brushed or black powdercoated finishes. The caps come in two styles--smooth edge for a clean cool look, or gripper with custom grip notched for easy removal.
( 1 )
$49.99
Scott Drake Radiator Caps
Help keep your cooling system running in tiptop shape with Scott Drake. Scott Drake offers authentic Concours and billet-style radiator caps. Scott Drake manufactures these caps from quality materials, ensuring years of trouble-free performance.
( 18 )
$21.90
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$33.47
Radium Engineering Radiator Caps
The radiator cap is an essential part of an upgraded cooling system. Radium Engineering radiator caps are engineered to safely improve cooling efficiency by managing the boiling temperature. A higher radiator pressure effectively raises the coolant boiling point, providing an extra safety margin, and preventing air pocket cavitation at the water pump. Each replacement radiator cap is manufactured from stamped stainless steel for durability. They are offered in two common styles: Type-A and Type-B—and all Radium 18-0076-X1X models are electroplated black. Unlike OEM caps, which use natural rubber gaskets, these radiator caps feature premium silicone sealing elements for long-lasting durability. They are available with three different relief springs: 1.1 Bar (16.0 psi), 1.3 Bar (18.9 psi), and 1.5 Bar (21.8 psi). Radium radiator caps are designed for mini size (32mm ID) radiator necks only. Please confirm the Radium radiator cap style your application requires, prior to placing your order.
Not Yet Reviewed
$28.45
Vibrant Performance Radiator Caps
Vibrant Performance radiator caps are specifically designed to fit their weld-on radiator filler necks. They're crafted from aluminum and attractively finished in a satin black. Vibrant engineered the radiator caps with finger notches to gain a good comfortable grip. Choose the size needed for your application.
( 1 )
$42.99
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$43.99
Proform Billet Aluminum Radiator Caps
Seal off your vehicle's cooling system in style with one of these Proform billet aluminum radiator caps. You'll notice the sleek design every time you lift the hood! These caps are manufactured from high-quality aluminum and then black anodized for a great look. The outer edge is knurled, so you can install and remove your radiator cap easily with one hand.
( 7 )
$38.95
Allstar Performance Recovery High-Pressure Radiator Caps
Turn to Allstar Performance high-pressure recovery radiator caps when you turn up the heat. Higher cooling system pressure raises the boiling point of coolant to reduce the risk of overheating—especially in racing applications. Recovery system caps allow coolant to exit the cooling system into an overflow or recovery bottle as the coolant heats and expands. As the system cools, recovery system caps will draw coolant back in to keep the cooling system full. Allstar steel or billet aluminum caps are available in different shapes, styles, and psi limits. Choose the model best suited for your radiator.
( 15 )
$9.99
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$28.99
Auto Metal Direct Radiator Caps
Auto Metal Direct offers several radiator caps to fit many vehicles. All AMD caps feature durable construction, a natural or polished finish, will fit standard radiator necks, and are designed to hold their designated psi. Keep your vehicle's cooling system functioning properly with an affordable, easy to install replacement radiator cap from Auto Metal Direct. Select one designed for you vehicle.
( 3 )
$38.99
Mopar Replacement Radiator Caps
If your cap has lost its "spring," it may be time for an upgrade. Mopar Replacement radiator caps will fit properly and maintain the proper pressure. They do more than just cover the opening of your radiator, so when choosing replacements, choose genuine Mopar caps for your ride. They're available for fitment on a wide range of applications.
( 4 )
$18.99
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$26.99
Motorcraft Radiator Caps
Radiator caps from Motorcraft are crafted from heavy-duty zinc plated steel and high-quality plastic, both resistant to rust and corrosion. Stainless steel pressure valve springs maintain the calibrated pressure for a maximum service life. These Motorcraft radiator caps include a rubber pressure valve gasket, and are able to withstand high temperatures and deterioration caused by coolant chemicals. Any accidental cap removal can be prevented with the "positive low-pressure" feature.
( 7 )
$8.99
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$43.99
Spectre Performance Radiator Caps
Spectre's chrome radiator caps are just the thing for topping off a great cooling setup. These flashy chrome plated steel caps are available to fit many applications.
( 20 )
$13.99
AFCO Racing Radiator Caps
AFCO radiator caps are available in a variety of shapes, sizes, materials and finishes—plain or with a racing logo. A loss of coolant can lead to your engine overheating. Secure the fluid with one of these AFCO Racing radiator caps. Choose the cap designed for your radiator's psi pressure limit.
( 4 )
$17.99
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$46.99
