Engine coolant cap Coolant expansion tank cover for Volvo Radiator Cap OE 30811055 Sealing cap

Product Description:

Coolant expansion tank cover
OE NO.: 30811055

Applicable vehicle type: For Volvo

The coolant expansion tank cap is a critical sealing and pressure control component of the automotive cooling system, installed on the top of the expansion tank (also known as the auxiliary reservoir or coolant recovery tank).

Main Functions:

1. Sealing the System: Prevents coolant leakage and maintains the closed nature of the cooling system.
2. Pressure Regulation: Maintains standard pressure within the cooling system to avoid excessive pressure causing pipe rupture or coolant boiling.
3. Safe Pressure Release: When pressure becomes too high, the expansion tank cap automatically releases excess pressure to ensure safety.
4. Preventing Air Ingress: Prevents air from entering the cooling system, avoiding bubble formation that can impair heat dissipation efficiency.

Fault Warning Signs

1. Frequent Reduction in Coolant Level: Check the cap's seal integrity and pressure valve functionality.
2. Insufficient System Pressure: May lead to boiling and overheating.
3. Inability to Release Excess Pressure: May result in pipe rupture.

• 20 years of specialized auto parts industry experience
• Expert technical team for comprehensive support
• Direct partnerships with repair shops for real-world feedback
• Premium quality parts ensuring reliability and durability
• Extensive inventory with over 500,000+ items ready to ship
• Responsive customer service with quick turnaround
• Customized solutions for specific vehicle requirements
• Professional technical guidance and installation support
• Comprehensive 12-month warranty coverage
• Competitive pricing through optimized supply chains
• Rigorous quality control meeting industry standards
• Efficient global shipping via multiple carriers

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 Volvo 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.