038 121 119B – Thermostat O-Ring

Description

The 038121119B Thermostat O-Ring is a precision-engineered sealing component manufactured by Elring, a globally recognized OEM supplier. This high-quality rubber seal sits between the thermostat and the thermostat housing to prevent pressurized coolant from escaping the engine block. Because the cooling system relies on a consistent internal pressure to raise the boiling point of the fluid, the 038121119B Thermostat O-Ring plays a vital role in thermal stability. Replacing this seal is mandatory whenever the thermostat is removed to ensure a professional, leak-free repair.

Why the 038121119B Thermostat O-Ring Matters

A reliable seal at the thermostat housing is essential for maintaining the correct engine operating temperature and preventing overheating. Over time, constant exposure to extreme heat and chemical coolants causes the original rubber to harden, flatten, or become brittle. Consequently, a compromised 038121119B Thermostat O-Ring will allow coolant to weep past the housing, reducing system pressure and efficiency. Furthermore, minor leaks can lead to gradual coolant loss that may initially go unnoticed until a major failure occurs. Therefore, using an OEM-spec Elring seal provides the durability needed for long-term engine protection.

Signs of Sealing Failure

Inspect your cooling system for these common indicators that the 038121119B Thermostat O-Ring requires replacement:

• Pink or orange crusty coolant residue around the thermostat housing flange.

• Evidence of wetness or dripping coolant underneath the water pump or housing area.

• A gradual drop in the coolant expansion tank level without visible hose leaks.

• The smell of sweet antifreeze after the engine has reached its operating temperature.

• Overheating during long drives or while idling in heavy traffic.

• A visible crack, flat spot, or deformation on the O-ring during a thermostat inspection.

Key Features

• OE Part Number: 038 121 119 B

• Manufacturer: Elring (Genuine OEM Quality).

• Material: Specific heat-resistant rubber compound designed for long service life.

• Function: Provides a high-pressure seal between the thermostat and the engine.

• Fitment: Engineered specifically for Volkswagen and Audi cooling system housings.

• Reliability: Restores the airtight integrity of the coolant circuit to prevent overheating.

Service Notes

Always verify fitment by VIN before ordering. When installing the 038121119B Thermostat O-Ring, it is standard practice to replace the thermostat itself at the same time to avoid repeating the labor. Furthermore, ensure the mating surfaces of the engine block and the plastic housing are completely clean and free of old debris or pitting.

Compatibility

Always verify fitment by VIN before ordering. This seal is widely used across various 4-cylinder and 6-cylinder Volkswagen and Audi engines.

Cross Reference Numbers

• 038 121 119 B

• 038121119B

• Elring 527.290

• Victor Reinz 70-33758-00

Additional information