Product Description:

Coolant expansion tank cap
OE NO.: MJA4440BA PCD500030

Applicable vehicle type: For Land Rover

The coolant expansion tank cap serves as a critical sealing and pressure control component within the automotive cooling system, mounted atop the expansion tank (also termed the reservoir or coolant recovery tank). Through its integrated spring-loaded valve mechanism, it maintains stable internal pressure within the cooling system, prevents coolant boiling and leakage, and provides safe pressure relief during overpressurisation.


Installation Guidelines

• Clean the expansion tank opening to ensure no contaminants are present
• Align the threads, manually pre-tighten, then secure with a torque wrench to the specified torque (typically 12-20Nm)
• Verify the seal ring is correctly positioned without deformation or crushing

Fault Indicators

• Frequent coolant depletion: Inspect the cap seal integrity and pressure valve functionality
• Insufficient system pressure: May lead to boiling and overheating
• Failure to release excess pressure: May cause pipe rupture

Multiply Brands Auto Parts We Offer:

Why choice us:

1. Industry Experience: 20 years of experience in the auto parts industry, with in-depth market and product knowledge.

2. Professional Team: A team of experienced experts who can professionally answer all customer inquiries about auto parts.

3. Direct Partnerships: Direct partnerships with multiple auto repair shops, offering first-hand industry feedback and technical support.

4. High-Quality Products: Providing high-quality auto parts to ensure reliability and durability.

5. Comprehensive Inventory: A wide range of product lines and ample inventory to meet diverse customer needs.

6. Quick Response: Offering rapid response services to quickly address customer questions and needs.

7. Customized Services: Providing customized part solutions to meet specific vehicle or customer requirements.

8. Technical Support: Offering professional technical support and installation guidance.

9. After-Sales Service: A strong after-sales service network to ensure customers receive necessary support after product use,If you have any questions after receiving the goods, please contact us in time and we will provide the best solution.

10. Price Advantage:Competitive pricing due to long-standing supply chain relationships.

11. Quality Assurance:All products go through strict quality control processes to meet industry standards.

12. Fast Shipping: Over 500000+ in stock, we can ship them in a short time.

Company Profile:

Beijing Huarui Jietong Trading Co., Ltd. has been engaged in the automotive aftermarket for 20 years and is a professional supplier of auto parts. Located in the capital of China, Beijing, we have factories in Beijing, Guangzhou, and Jiangsu, which enable us to meet our customers' demands for quality and quantity in a timely and efficient manner.



The company primarily focuses on accessories for Land Rover, Jaguar, and VO LVO product series, including Air Conditioning Systems, Braking Systems, Driving Systems, Engine Systems, Cooling Systems, Auto Body Systems, Steering Systems, Suspension Systems, Transmission Systems, and other related parts. Facing the trend of economic globalization, our company is committed to bringing better products and services to the world, providing high-quality products and services for domestic and foreign enterprises and customers.

We welcome any inquiries and look forward to your contact.







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