S11-1311110KA
Product Details
Comprehensive Professional Description: Chery QQ Expansion Water Tank (Part No. S11-1311110KA)
1. Basic Overview & Core Functional Positioning
The S11-1311110KA is an authentic original equipment manufacturer (OEM) expansion water tank, also known as a coolant recovery reservoir or overflow tank, specially designed and produced for the Chery QQ compact hatchback, serving as an indispensable auxiliary component of the vehicle’s engine cooling system. As a key part responsible for coolant volume compensation, pressure regulation, and air exhaust within the cooling circuit, this expansion water tank plays a vital role in maintaining the normal operating temperature of the Chery QQ engine, ensuring the stability and efficiency of the entire cooling system under diverse driving conditions.
Mounted in a fixed position within the Chery QQ’s engine compartment, this expansion water tank is connected to the engine’s main water jacket, radiator, and water pump through specialized hoses, forming a closed and circulating cooling system. Its core functions include accommodating the volume expansion of coolant when the engine heats up, releasing excess pressure to prevent damage to cooling system components such as the radiator, water pipes, and engine cylinder head, supplementing coolant to the system when the engine cools down and contracts, and eliminating air bubbles inside the cooling circuit to avoid air locks that cause engine overheating.
For the Chery QQ, a compact and economical city car positioned for daily urban commuting and short-distance travel, the S11-1311110KA expansion water tank is customized to match the vehicle’s small-displacement engine cooling system parameters and compact engine compartment layout. It features a miniaturized, space-saving design that fits perfectly into the limited installation space without interfering with other engine components. The operational reliability, sealing performance, and pressure resistance of this expansion water tank directly affect the engine’s heat dissipation effect; once it malfunctions, such as coolant leakage, crack, or pressure valve failure, it will lead to insufficient coolant, poor heat dissipation, engine overheating, and even severe damage to core engine parts like the cylinder head and piston.
2. Material Selection & Precision Manufacturing Process
The S11-1311110KA expansion water tank is manufactured from high-performance, heat-resistant and corrosion-resistant engineering plastics, selected strictly in accordance with Chery’s OEM quality standards and automotive cooling system component material specifications, aiming to adapt to the long-term harsh operating environment of the engine compartment with alternating high and low temperatures, coolant corrosion, and vibration. The main body of the tank adopts premium modified polypropylene (PP) plastic, which boasts excellent thermal stability, chemical resistance, low-temperature toughness, and impact resistance, making it the ideal material for automotive cooling system reservoirs.
This modified PP material can withstand a wide temperature range from -40℃ to 120℃, remaining rigid and non-deformable when exposed to high-temperature coolant, and not becoming brittle or cracking in low-temperature environments, ensuring stable performance in extreme weather conditions. It also has outstanding resistance to ethylene glycol-based engine coolant, preventing dissolution, swelling, or aging caused by long-term contact with coolant, which effectively extends the service life of the expansion water tank. Compared with ordinary plastic materials, this special modified plastic has higher mechanical strength, resisting breakage caused by engine vibration and minor external impacts during driving.
The manufacturing process of the S11-1311110KA expansion water tank adopts one-time precision injection molding technology using automated CNC injection molding machines, which ensures the tank’s integrated structure, uniform wall thickness, and smooth inner and outer surfaces without weld marks, pores, or defects that affect strength and tightness. The integrated molding design eliminates the risk of leakage caused by multi-piece assembly, greatly improving the overall sealing performance of the tank. After injection molding, the tank undergoes strict trimming and polishing to remove burrs, and reserved interfaces including water inlet/outlet nozzles, pressure cap mounting seat, and liquid level scale area are precisely formed to match the original cooling system pipelines and components.
The tank is equipped with a professional OEM pressure cap, which is made of high-temperature resistant plastic and high-elasticity rubber gaskets, with a calibrated pressure relief valve and vacuum valve inside, set to match the Chery QQ cooling system’s rated working pressure. Before leaving the factory, every S11-1311110KA expansion water tank undergoes rigorous quality testing, including hydraulic pressure testing, sealing testing, temperature cycle testing, and impact resistance testing, to ensure each product fully meets Chery’s original factory performance requirements and avoids common faults such as coolant leakage and burst cracks during use.
3. Structural Design & Key Functional Components
The S11-1311110KA expansion water tank features a compact, ergonomic structural design tailored to the Chery QQ’s engine compartment space and cooling system layout, with a reasonable internal and external structure that realizes multiple functions such as expansion, compensation, pressure regulation, and air exhaust. Its key structural components include the tank main body, integrated inlet/outlet nozzles, liquid level indication scale, pressure cap assembly, mounting bracket, and internal diversion structure.
The tank main body is the core container for storing coolant, with a capacity precisely calculated to match the Chery QQ’s cooling system demand, sufficient to accommodate the expanded volume of coolant when the engine reaches operating temperature. The tank is designed with a transparent or semi-transparent scale area on the side, clearly marked with “MIN” (minimum) and “MAX” (maximum) liquid level lines, allowing maintenance personnel and vehicle owners to directly observe the coolant volume and replenish it in a timely manner, which is convenient for daily inspection and maintenance of the cooling system.
The integrated inlet and outlet nozzles are molded with the tank body as a whole, with smooth inner walls and standard pipe diameters, perfectly matching the original Chery QQ cooling hoses to ensure tight connection and no coolant leakage. The nozzles are designed with a certain inclination and length to facilitate hose installation and disassembly, while avoiding hose kinking that affects coolant circulation. The mounting bracket is integrated on the tank body, with pre-set bolt holes that align with the Chery QQ’s engine compartment mounting points, enabling stable and firm fixation to prevent displacement or shaking caused by engine vibration during driving.
The pressure cap assembly is mounted on the top of the tank, equipped with a dual-function valve system: a pressure relief valve and a vacuum valve. The pressure relief valve automatically opens when the cooling system pressure exceeds the rated value, releasing excess pressure to protect the radiator, water pipes, and engine from damage; the vacuum valve opens when the engine cools down and the system forms negative pressure, sucking the coolant in the expansion tank back into the main cooling circuit to ensure sufficient coolant volume. The internal diversion structure of the tank guides the flow of coolant smoothly, accelerating air bubble discharge and preventing air accumulation in the tank, which guarantees the efficiency of the cooling system.
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