Home » Coolant Water Filler Neck Assy Direct Fit For Toyota Yaris Vios

Coolant Water Filler Neck Assy Direct Fit For Toyota Yaris Vios

SKU: 1005012343459135-Cover X1
Color
€22,86
-38% €36,58 €22,86

This coolant water filler neck assembly delivers a precise direct-fit replacement for failed factory cooling system components on select Toyota and Scion models. When original plastic filler necks degrade, crack, or lose their vacuum seal, engines frequently overheat, show low-pressure warnings, or leak hot coolant around the upper radiator hose. This part restores proper system pressure and creates a hermetic connection between the radiator cap and the thermostat housing pipe. Manufactured from glass-reinforced PA66+GF30 nylon, it tolerates repeated thermal cycling and ethylene glycol exposure that typically causes premature failure in stock units. It is engineered specifically for Toyota Yaris NCP91 (1.5L 1NZ), Toyota Vios NCP92/NCP93 (1.3L/1.5L 1NZ/2NZ), and Scion xD ZSP110 (1.8L 2ZR) vehicles produced between 2006 and 2014.

Benefits & Tips

  • Match the stamped OEM reference numbers on your current part to 16502-21070 or 16321-21020 before purchasing to guarantee correct routing.
  • Gently scrub the mating flange and hose connection points with a clean cloth to remove old gasket residue or scale before installing the new neck.
  • Bleed the cooling system thoroughly after reassembly to eliminate trapped air, which commonly triggers erratic temperature readings on these platforms.

Product Specifications

  • Primary Material: Glass-filled PA66+GF30 Polyamide
  • OE Cross-Reference: 16321-21020, 16502-21070, 1650221070
  • System Function: Coolant reservoir intake and overflow control channel
  • Mating Requirement: Designed for direct pairing with standard OEM-style radiator caps

Package Includes:

  • One (1) Coolant Water Filler Neck Assembly

Installation Reminders

This component operates inside a pressurized cooling circuit. Always allow the engine to reach complete coldness before disconnecting hoses to avoid scalding risks. Reconnect clamps securely to manufacturer torque guidelines, then refill with the correct coolant specification and inspect for drips while gently revving the engine to circulate fluid.

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