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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; Billet Radiator Cap; 16 psi; Knurled Edge; Polished Top; Aluminum
Part Number: CTR-81-116
Estimated Ship Date: Today
Estimated Ship Date: Today
RAD CAP GIRDLE - Polymer Printed Carbon Top - Fits Drag Race Solutions Billet Water Filler Neck
Part Number: CHH-3300-003B
Not Yet Reviewed
Estimated Ship Date: Tomorrow if ordered today
Estimated Ship Date: Tomorrow if ordered today
Radiator Cap, Aluminum, Natural, Round, Be Cool Logo, 13 psi, Each
Part Number: BCI-70001
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Aluminum, Natural, Octagon, Be Cool Logo, 13 psi, Each
Part Number: BCI-70002
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Steel, Natural, Octagon, Be Cool Logo, 25 psi, Each
Part Number: BCI-70025
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Aluminum, Polished, Round, Be Cool Logo, 13 psi, Each
Part Number: BCI-71001
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Steel, Natural, Octagon, Be Cool Logo, 32 psi, Each
Part Number: BCI-70032
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Chrome, Hexagon, 14-18 psi, Each
Part Number: SPE-4338
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, 16 PSI, Aluminum, Black Anodized, Each
Part Number: PGP-PRP-7651
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Round, Finned Style, 16 psi, Polished, Each
Part Number: OTT-6201
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Aluminum, Polished, Octagon, Be Cool Logo, 13 psi, Each
Part Number: BCI-71002
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Round, Finned Style, 7 psi, Polished, Each
Part Number: OTT-6202
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Round, Aero Style, 16 psi, Polished, Each
Part Number: OTT-6210
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Round, Sprocket Style, 16 psi, Polished, Each
Part Number: OTT-6220
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Round, Sprocket Style, 7 psi, Polished, Each
Part Number: OTT-6221
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Round, Aero Style, 7 psi, Polished, Each
Part Number: OTT-6211
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, 16 PSI, Aluminum, Polished, Each
Part Number: PGP-PRP-7650
Not Yet Reviewed
Estimated Ship Date: Oct 15, 2025 if ordered today
Estimated Ship Date: Oct 15, 2025 if ordered today
Radiator Pressure Tester Adapter, Set of 20
Part Number: CSF-4509
Not Yet Reviewed
Estimated Ship Date: Nov 3, 2025 if ordered today
Estimated Ship Date: Nov 3, 2025 if ordered today
Radiator Cap, Steel, Round w/Tabs, 22-24 psi, Each
Part Number: HRE-3427
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Safecap, Billet Aluminum, Clear Anodized, Round, 16 psi, Each
Part Number: MEZ-WCC300
Estimated Ship Date: Today
Estimated Ship Date: Today
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