Help your cooling system hold its designed pressure with the Gates 31528 OE Type Radiator Cap. It is also listed as an Engine Coolant Reservoir Cap / Radiator Cap. It fits many vehicles, among them the 2011-2024 Ram 1500 (V8-5.7L), 1999-2010 Dodge Ram 1500 and 1994-2010 Dodge Ram 2500. It is a direct-fit replacement for the listed applications. See the Buyer's Guide tab for the full list of vehicles and engine codes.
A pressure cap seals the cooling system so the coolant can run above its normal boiling point. Its vacuum-relief valve relieves vacuum as the coolant cools and contracts. Gates engineered this cap for precise pressure control, and it needs no adjustment to install.
- Precise pressure control: uses application-specific vent and vacuum-relief valves.
- Pressure rating: listed at 16 psi, within a 14-18 psi range. Standard cap type.
- OE Performance grade: built to match or surpass OEM specifications for form, fit and function.
- No adjustment needed: installs as supplied.
Specifications: shell outside diameter 2.33 in; cap depth 1.25 in; filler neck depth 0.75 in (19 mm); filler neck inside diameter 1.61 in (41 mm); filler neck outside diameter 2.13 in (54 mm); coolant recovery system optional. Quantity per application: 1. Country of origin: China.
Signs a pressure cap may need replacing include coolant loss with no visible leak, a reservoir that overflows, overheating, or a hose that collapses as the engine cools. Other cooling-system parts can cause the same symptoms, so diagnose the cause before replacing.
