High-Pressure Radiator Cap and Radiator Cap Replacement Parts for Cars and Trucks

A radiator cap holds your cooling system at the pressure it was designed to run at, raising the boiling point of coolant well above what it would be at atmospheric pressure alone. CBT Auto Parts stocks radiator cap and radiator pressure cap options for cars, trucks, and SUVs.

Every radiator cap replacement here is OEM grade or built to OEM specification, so pressure rating and seal design match the original. Confirm fitment by year, make, and model, then add a radiator or coolant reservoir from the wider Cooling, HVAC and Climate Control Parts range. Orders ship fast worldwide, with support on hand if you're unsure which cap fits.

Radiator Caps

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FAQs

1. What does the number on a radiator cap mean?

It's the pressure rating in PSI or bar, the point at which the cap releases excess pressure into the reservoir to protect the rest of the system.

2. Is a higher-pressure radiator cap better?

Not for most daily drivers, the factory rating already has margin built in; a higher rating mainly helps performance vehicles already pushing cooling capacity to its limit.

3. What's the radiator cap seal, and why does it matter?

It's the rubber gasket inside the cap, and it's usually the actual failure point, hardening and losing its seal years before the cap's mechanical parts wear out.

4. What are the signs of a radiator cap leaking?

Coolant staining around the cap, a hissing sound when loosened, or frequent low coolant warnings with no other visible leak.

5. Can I replace a radiator cap myself?

Yes, it's one of the simplest jobs in this collection. Just make sure the system is completely cold before removing the old cap.