Chery FX Expansion Tank (Part No.: T21-1311110)

First of all, let's clarify its core function: The Chery FX expansion tank T21-1311110 is not merely a "coolant storage tank" - it is the core of pressure regulation and fluid management in the vehicle's cooling system. It can be imagined as a durable and heat-resistant plastic water tank installed in the engine compartment of Chery FX, connected to the radiator through a hose. What is its main job? To accommodate the expansion of coolant when the engine is heated (to prevent system pressure accumulation), store additional coolant to refill when the level drops and release trapped air from the cooling system - ensuring that the engine remains at a safe operating temperature. Without it, the cooling system is at risk of overheating, leakage and even engine damage.

This expansion fuel tank is specially designed for Chery fx - please be sure to confirm your vehicle's VIN! It is tailor-made for the engine compartment and cooling system of FX: its capacity matches the engine coolant requirements of FX (not less than/more than the storage), its hose connections are aligned with the radiator ports (no leakage), and its rated pressure is synchronized with the pressure cap of the system (maintaining the best cooling efficiency). Universal expansion tank? You will encounter some problems: it is too small (unable to handle coolant expansion), the hose fittings do not match (coolant leakage), or it lacks heat resistance (bending under the heating of the engine compartment) - which will damage the performance of the cooling system.

1. Core work: Why does this fuel tank keep the engine cool

Its role is the key to preventing the engine from overheating - here are four key tasks, and it performs Chery FX:

Regulate system pressure: When the engine is heated, the coolant expands. The water tank absorbs this expanding liquid to prevent excessive pressure on the radiator (which would cause the coolant to boil at a higher temperature and improve the cooling efficiency).

Store spare coolant: When the engine cools down, the coolant contracts, and the fuel tank sends the spare liquid back to the radiator, keeping the system full (without reducing the air gap for cooling).

Release trapped air: Bubbles in the cooling system block the flow of coolant (causing hot spots). The design of the water tank allows air to rise to the top and escape, ensuring smooth circulation of the coolant.

Convenient inspection: The clear markings (min/max) on the radiator allow you to quickly check the coolant level without opening the radiator cap - safe and convenient.

• Fits These Models: All Chery FX variants (matches engine cooling system capacity, hose ports, and pressure rating—confirm via VIN).

• Won’t Fit These:

• Other Chery models (e.g., X22 Pro, Tiggo 7 Pro): Their cooling system sizes, hose positions, and pressure requirements differ—tank won’t connect or function.

• Non-Chery vehicles: Even if it “looks similar,” the hose interfaces and pressure ratings are incompatible—causes leaks or overheating.

 Installation & Maintenance (Pros Recommended—Sealing Is Key!)

Installation: Certified Chery Technicians Preferred

1. Drain old coolant: Technicians drain the Chery FX’s cooling system to avoid spills, then disconnect the hoses from the old tank.

2. Mount the new tank: They secure T21-1311110 to the engine bay’s mounting points (uses factory bolts), then reattach the radiator hoses (ensuring tight clamps to prevent leaks).

3. Refill and bleed air: They add Chery-approved coolant to the tank (up to the “max” line), then start the engine to circulate fluid and bleed trapped air from the system.

4. Test for leaks: They check hose connections and the tank for seepage while the engine runs (ensuring no pressure loss).

Maintenance: Keep the Cooling System Healthy

• Check levels monthly: Ensure coolant stays between “min” and “max” marks (top up with approved coolant if low—never use just water).

• Inspect for cracks yearly: Look for plastic cracks or hose leaks (coolant is toxic and flammable—repair leaks immediately).

• Replace coolant every 2–3 years: Old coolant loses anti-corrosive properties (protects the tank and radiator from rust).

• Clean the tank exterior: Wipe dust/debris from the tank (prevents overheating of the plastic and keeps level markings visible).

Summary: Chery FX Expansion Tank (T21-1311110)

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