25330-3K000
KINGMAY
25330-3K000
Hyundai, Kia
2015, 2014, 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2004, 2003, 2002, 2001, 2000
Cooling System
Santa Fe, Tucson, Sonata, Genesis Coupe, Sorento, Optima (K5）, Soul
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Product Description
The 25330-3K000 Radiator Cap Assembly is designed for selected Hyundai and Kia vehicle cooling systems, where it helps maintain the correct cooling-system pressure and provides a secure seal at the radiator or coolant reservoir connection. It is also referenced as 253303K000 and Cap Assembly-Radiator in Hyundai/Kia parts catalogs.
Built with a durable metal structure and sealing components, this radiator cap is designed to withstand repeated heating and cooling cycles in the engine compartment. Its pressure-controlled design helps the cooling system operate efficiently while reducing the risk of coolant loss, pressure imbalance and engine overheating.
For replacement and aftermarket applications, the 25330-3K000 provides a compact, direct-replacement solution for compatible Hyundai and Kia vehicles. Buyers should confirm the OE number, engine specification and VIN before ordering because fitment may vary by model, production year and cooling-system configuration.
OE Reference 25330-3K000 – Designed as a replacement for cooling systems using OE reference 25330-3K000 / 253303K000.
1.1 Bar Pressure Rating – Designed to maintain approximately 1.1 bar of cooling-system pressure and release excessive pressure when required.
Durable Metal Construction – Stainless-steel construction is listed for current aftermarket 25330-3K000 applications on eBay.
Reliable Sealing Performance – Helps prevent coolant leakage and loss of cooling-system pressure.
Temperature & Pressure Resistance – Suitable for repeated engine heating and cooling cycles.
Direct Replacement Design – Compact configuration for convenient replacement of a worn or damaged radiator cap.
Cooling System Protection – Helps protect hoses, radiator components and other cooling-system parts from abnormal pressure.
Easy Maintenance Replacement – No complex modification is normally required when replacing the correct OE-matched cap.
| Specification | Details |
|---|---|
| Product Name | Radiator Cap / Cap Assembly-Radiator |
| OE Number | 25330-3K000 / 253303K000 |
| Replacement References | 2533038001 / 2533039100 |
| Application | Engine Cooling System |
| Compatible Makes | Selected Hyundai / Kia Vehicles |
| Material | Stainless Steel / Metal with Sealing Components |
| Pressure Rating | Approx. 1.1 Bar |
| Reference Length | Approx. 59 mm / 2.32 in |
| Reference Width | Approx. 46 mm / 1.81 in |
| Reference Height | Approx. 25 mm / 0.98 in |
| Reference Net Weight | Approx. 41 g / 1.45 oz |
| Color | Silver Tone |
| Fitment Type | Direct Replacement |
| Installation Position | Radiator / Cooling System |
| Condition | New |
| Sales Model | B2B Wholesale / Aftermarket Replacement |
The 59 × 46 mm dimensions and 41 g net weight are based on a current eBay aftermarket listing for 25330-3K000, while another eBay listing gives a reference height of approximately 25 mm. These measurements should therefore be treated as reference aftermarket dimensions rather than Hyundai/Kia engineering drawing specifications.
A radiator cap may appear to be a simple component, but it performs an important pressure-control function within the vehicle's cooling system.
As engine temperature rises, the coolant expands and cooling-system pressure increases. The radiator cap seals the system so that the coolant can operate under the designed pressure range. Maintaining this pressure helps the cooling system manage engine heat efficiently and reduces premature coolant boiling.
The cap also acts as a pressure-relief device. When system pressure rises above the cap's designed threshold, its internal valve allows excessive pressure to be released or transferred through the cooling-system recovery circuit.
This controlled pressure is important because both insufficient pressure and excessive pressure can interfere with normal cooling-system operation.
The 25330-3K000 Radiator Cap works through an internal spring-loaded pressure valve and sealing structure.
1. Engine Starts and Coolant Heats Up
As the engine reaches operating temperature, coolant expands and pressure begins to rise inside the cooling system.
2. The Cap Maintains System Pressure
The sealing surface keeps the radiator or cooling circuit closed, helping maintain the required pressure instead of allowing coolant vapor or liquid to escape.
3. Excess Pressure Is Released
When cooling-system pressure exceeds the cap's calibrated pressure level, the internal valve opens to relieve excessive pressure. For 25330-3K000 replacement caps, a pressure rating of approximately 1.1 bar is commonly specified.
4. Pressure Returns to Normal
As the engine cools and coolant contracts, the cooling system returns toward normal pressure conditions, allowing the system to continue operating through repeated heating and cooling cycles.
This simple pressure-control process helps protect the radiator, coolant hoses, seals and other cooling-system components.
A damaged, worn or incorrectly sealing radiator cap can cause several cooling-system problems.
Coolant Leakage
If the sealing surface becomes worn or damaged, coolant may escape around the cap and gradually reduce the amount of coolant available for engine cooling.
Loss of Cooling-System Pressure
A weak cap spring or damaged seal may prevent the system from maintaining the designed pressure. This can reduce the coolant's effective boiling margin and contribute to overheating.
Engine Overheating
If coolant is lost or cooling-system pressure cannot be maintained correctly, engine operating temperature may rise beyond the normal range.
Excessive Cooling-System Pressure
If the pressure-relief valve becomes stuck and cannot open correctly, excessive pressure may build inside the system. This can place additional stress on radiator tanks, hoses, clamps, seals and other cooling-system components.
Coolant Overflow or Reservoir Problems
Incorrect pressure control can cause abnormal coolant movement between the radiator and recovery reservoir, resulting in overflow or inconsistent coolant levels.
Potential Engine Damage
Continuing to operate an overheating engine can eventually contribute to more serious problems involving cylinder-head gaskets, cylinder heads and other temperature-sensitive engine components.
For this reason, a radiator cap showing signs of corrosion, damaged seals, coolant leakage or weak spring pressure should be inspected and replaced when necessary.
OEM-Grade Replacement Supply
KINGMAY specializes in B2B wholesale automotive parts for Japanese and Korean vehicles. Parts are sourced and inspected in Guangzhou, with OEM-number cross-reference and vehicle-fitment support available for international buyers.
Quality Inspection
Orders undergo pre-shipment inspection, including dimensional and functional verification where applicable. Material certification and batch traceability can also be provided for selected products upon request.
OEM Number & Fitment Verification
Buyers can provide an OE number, VIN, chassis number or photo of the original part for matching assistance before placing a bulk order, helping reduce incorrect purchases and fitment problems.
Sample Support
Samples can be arranged for quality and fitment verification before larger wholesale orders. KINGMAY's official ordering process includes sample approval before bulk production where required.
Flexible Wholesale Supply
KINGMAY supports B2B orders across engine, cooling, suspension and electrical systems, allowing buyers to consolidate different automotive parts into one shipment to reduce logistics and customs-processing costs.
KINGMAY provides flexible international shipping solutions according to order quantity, destination and delivery requirements.
Sea Freight:
Shipping from Guangzhou ports to Iraq, Saudi Arabia and Turkey normally takes approximately 25–30 days by sea, depending on vessel schedules, customs clearance and destination port conditions.
Urgent Samples:
For sample orders or urgently required parts, DHL / UPS international express shipping is also supported.
Consolidated Shipping:
Different engine, cooling, suspension and electrical parts can be consolidated into the same shipment, which is especially suitable for wholesalers, distributors and repair-parts importers purchasing multiple OE numbers. KINGMAY's official site also confirms consolidated export shipments from Guangzhou and shipment via Nansha Port.
Export Documentation:
Commercial invoices, packing lists, certificates of origin and other applicable export documents can be prepared according to shipment requirements.
KINGMAY provides a 24-month warranty for this product under the applicable sales terms.
If a verified product-quality issue occurs within the warranty period, buyers can contact the KINGMAY sales team with the order information, OE number, photos or videos of the issue for after-sales evaluation.
Our B2B support includes:
24-Month Warranty
Pre-shipment quality inspection
OE number and fitment verification
Technical support for product-related questions
Sample verification before bulk purchasing
After-sales support for verified quality issues
WhatsApp / WeChat / Email communication
Private-label and customized packaging support for eligible bulk orders
KINGMAY also provides dedicated B2B account support for technical enquiries, OE cross-reference checks and parts matching.
