037 121 144H – Coolant Flange

Description

The 037121144H Coolant Flange is a vital engine component that manages the distribution of fluid between the engine block and the radiator. Because Volkswagen and Audi engineers utilized hard plastic for these cooling connections, they are subject to significant wear over time. This 037121144H Coolant Flange is designed to meet exact factory specifications, ensuring a direct fit and restoring the pressurized seal of your cooling system. Installing a fresh unit prevents the common issue of sudden plastic failure during high-temperature operation.

Why the 037121144H Coolant Flange Matters

Engine cooling systems operate under high pressure and intense heat cycles every time the vehicle is driven. Over the years, the plastic material in the factory unit becomes dangerously brittle and prone to structural failure. Consequently, a hairline crack in the 037121144H Coolant Flange can lead to immediate coolant loss and severe engine overheating. Furthermore, this replacement includes the necessary sealing gasket for the cylinder head to ensure a leak-free mounting surface. Therefore, addressing a weeping flange early protects your cylinder head from the costly damage of an overheat event.

Signs of Sealing Failure

Inspect your engine bay for these common indicators that your cooling system requires a new 037121144H Coolant Flange:

• Dried pink or orange coolant residue around the flange mounting area.

• A noticeable smell of antifreeze after the engine has reached operating temperature.

• Small puddles of coolant forming under the vehicle when parked.

• Fluctuating engine temperature readings on the dash.

• Low coolant level warnings appearing on the instrument cluster.

• Visible hairline cracks or warping on the plastic flange housing.

Key Features — 037121144H Coolant Flange

• OE Part Number: 037 121 144 H

• Material: Durable, heat-stabilized plastic construction for long-term service.

• Fitment: Direct OEM replacement for a precise, plug-and-play installation.

• Seal Included: Comes with the critical sealing gasket to the cylinder head.

• Reliability: Restores cooling system pressure and prevents performance-robbing leaks.

• Precision: Manufactured to OE specifications for exact hose and sensor alignment.

Service Notes

Always verify fitment by VIN before ordering. When replacing the 037121144H Coolant Flange, remember that the O-rings for the sensors are not included and must be ordered separately under part number N 903 168 02. Furthermore, never attempt this repair on a hot engine, as the pressurized coolant can cause severe burns.

Compatibility

Always verify fitment by VIN before ordering. This housing is commonly found on 4-cylinder Volkswagen gasoline engines.

Cross Reference Numbers

• 037 121 144 H

Additional information