Aluminum Thermostat w/Water Pump – 06H 121 026ED (Graf)

Description

The 06H 121 026ED Water Pump and thermostat assembly is an integrated cooling module manufactured by Graf for select Volkswagen and Audi EA888 2.0T TSI/TFSI engines. Combining the mechanical coolant pump and electronically controlled thermostat into a single housing, this module manages both coolant circulation and temperature regulation simultaneously. Its key distinction is the robust aluminum housing, which resists the heat cycling, warping, and cracking that are common failure points on original plastic designs — delivering a measurably longer service life and eliminating the most frequent leak sources on EA888 cooling systems.

Graf is a globally recognized OE cooling system supplier trusted by European automakers. The 06H 121 026ED is engineered to match the original factory assembly in impeller geometry and thermostat calibration while upgrading the housing material to aluminum for superior structural integrity. The assembly retains all original hose connections and sensor ports for a direct bolt-on installation, and includes all required O-rings and seals for a complete single-service repair.

Signs Your 06H 121 026ED Water Pump Needs Replacing

Integrated water pump and thermostat assemblies on EA888 engines are a well-documented failure point as mileage increases. Early warning signs include coolant odor from the engine bay, pink or orange residue around the housing seam or hose connections, and low coolant warnings. As the condition progresses, intermittent overheating and stored fault codes related to thermostat performance become common. In some cases, internal impeller wear causes inadequate coolant flow without any visible external leak, leading to overheating under load. When these symptoms appear, replacing the complete assembly immediately is the safest course of action to protect the turbocharged engine.

Key Features

• OEM Reference: 06H 121 026ED

• Brand: Graf — globally trusted OE cooling system supplier

• Integrated water pump and electronically controlled thermostat in one assembly

• Aluminum housing — superior heat resistance and durability over original plastic designs

• OE-matched impeller design for factory-spec coolant flow

• Factory-calibrated thermostat for precise temperature regulation

• Includes all required O-rings and seals

• Retains original hose connections and sensor ports

• Direct bolt-on replacement — no modifications required

• Eliminates common EA888 housing leaks and thermostat fault codes

Service Notes

Refill with VW/Audi-approved G13 coolant and bleed the cooling system thoroughly after installation. Inspect the accessory belt and tensioner during the same service interval. Given the labor involved in accessing this assembly, it is also recommended to inspect nearby plastic coolant fittings and hose connections for signs of heat fatigue and replace as needed.

Compatibility & Applications

Always verify fitment by VIN before ordering. Engine variant and production date may affect compatibility within the same model year; confirm applicability for your specific vehicle before purchase.

Cross Reference Numbers

• 06H 121 026AB

• 06H 121 026AE

• 06H 121 026AF

• 06H 121 026BA

• 06H 121 026BD

• 06H 121 026BH

• 06H 121 026BM

• 06H 121 026BQ

• 06H 121 026DA

• 06H 121 026DB

• 06H 121 026DC

• 06H 121 026DD

Additional information