Caterpillar Radiator Caps — Pressure Relief Components

The radiator cap controls the maximum pressure within the cooling system. By maintaining a set pressure level, it raises the boiling point of the coolant, preventing overheating. When pressure exceeds the cap's rating, the relief valve opens to release excess pressure, protecting hoses, radiator cores, and gaskets from damage.

Yes, even a 1 PSI difference can matter on heavy equipment. Using a cap with a lower rating than specified may cause premature pressure release and coolant loss. A higher rating could stress hoses and seals not designed for that pressure. Always use the exact PSI rating specified by Caterpillar for your model.

Identify your CAT model number (e.g., D11N, 950G II, C15, C18) and cross-reference it with available cooling components. Radiator Supply House lists compatibility by equipment model and part number. You can also contact their team directly via phone or chat to confirm the correct cap for your specific machine configuration.

Yes, OEM-equivalent aftermarket caps — such as those from the ICEBOX line — are designed to match original Caterpillar specifications for pressure rating, sizing, and sealing. They offer a cost-effective alternative without compromising cooling system integrity, provided they are sourced from a reputable specialist like Radiator Supply House.

In addition to radiator caps and gaskets, Radiator Supply House offers radiators, radiator cores, charge air coolers, oil coolers, and complete cooling packages for Caterpillar equipment. This makes it possible to source all cooling system maintenance and replacement parts from a single supplier.

Yes, Radiator Supply House serves customers across the USA and worldwide. Shipping details, delivery timeframes, and return policies are available upon direct inquiry. You can reach their team by phone at 1-877-615-3002, by email at info@RadiatorSupplyHouse.com, or by clicking the Talk to an Expert button below during business hours, Monday through Friday, 7AM–5PM.