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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 26 Items.
Radiator Cap, Steel, Hexagon, Moroso Logo, 19-21 psi, Each
Part Number: MOR-63320
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Steel, Hexagon, Moroso Logo, 23-25 psi, Each
Part Number: MOR-63324
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Steel, Hexagon, Moroso Logo, 14-18 psi, Each
Part Number: MOR-63316
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Steel, Hexagon, Moroso Logo, 31-33 psi, Each
Part Number: MOR-63332
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Steel, Hexagon, Moroso Logo, 27-29 psi, Each
Part Number: MOR-63328
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Steel, Hexagon, Moroso Logo, 12-16 psi, Each
Part Number: MOR-63313
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Steel, Hexagon, Moroso Logo, 6-8 psi, Each
Part Number: MOR-63307
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Round, 22 psi Maximum Pressure, Stainless, Black, for 32mm I.D. Radiator Necks, for use on Honda®, for Nissan, Subaru, Toyota, Each
Part Number: RDM-18-0076-A15
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, 13 psi, Round, Steel, Natural, Edsel, Ford, Lincoln, Mercury, Each
Part Number: MOF-RL12
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, 16 psi., Round, Plastic, Black, Ford, Lincoln, Mercury, Each
Part Number: MOF-RS527
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Round, 16 psi Maximum Pressure, Stainless Steel, Black, Radium Engineering Logo, for 32mm I.D. Radiator Necks, for Nissan, Toyota, Each
Part Number: RDM-18-0076-A11
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Steel, Hexagon, Moroso Logo, 8-10 psi, Each
Part Number: MOR-63309
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, 21 psi., Round, Plastic, Black, Ford, Lincoln, Each
Part Number: MOF-RS531
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Steel, Hexagon, Moroso Logo, 34-38 psi, Each
Part Number: MOR-63333
Not Yet Reviewed
Estimated Ship Date: Nov 24, 2025 if ordered today
Estimated Ship Date: Nov 24, 2025 if ordered today
Radiator Cap, Motorcraft, 16 psi., Round, Plastic, Ford, Lincoln, Mercury, Each
Part Number: MOF-RS90
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Cap, Radiator, Plain, Round, OEM Replacement, Dodge, Each
Part Number: MOP-52079880AA
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Steel, Hexagon, Moroso Logo, 38-42 psi, Each
Part Number: MOR-63350
Not Yet Reviewed
Estimated Ship Date: Nov 24, 2025 if ordered today
Estimated Ship Date: Nov 24, 2025 if ordered today
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