A-Premium Engine Coolant Thermostat Housing Assembly for Audi & VW 2.0L L4 — Black Plastic, Gasket Included

The A-Premium Engine Coolant Thermostat Housing Assembly is a direct-fit replacement thermostat housing designed for many Audi and Volkswagen 2.0L L4 engines, providing a complete black plastic housing with gasket and two mounting points for reliable cooling-system connections.

This thermostat housing assembly is built to match factory fitment and routing for a wide range of Audi and VW models with the 2.0L L4 engine. Constructed of durable plastic and supplied with the necessary seal, it replaces aged or leaking housings that can cause coolant loss, overheating risk, or poor heater performance. Reference numbers include CH6001, 902-5866, 06H121121K/L, and CO34804 for cross-checking fitment against your vehicle service information.

Which vehicles does this A-Premium thermostat housing fit?

This assembly covers many late-2000s to mid-2010s Audi and Volkswagen models equipped with the 2.0L L4 engines. Fitment varies by engine code and location; always compare reference numbers and part location (rear, upper, or water pump) to your vehicle’s current part before purchasing.

• Audi: A3 (2008–2013), A4/A4 allroad/A5/A6/Q5 and various Quattro models (see full list for years and codes).
• Volkswagen: Beetle, CC, Eos, Golf, GTI, Jetta, Passat, Tiguan and related variants across model years noted in fitment details.
• Engine focus: L4 2.0L engines with matching engine codes (CCTA, CBFA, CCTA, CETA and others referenced).
• Reference part numbers: CH6001, 902-5866, 06H121121K/L, 86001, CO34804 for verification.

How does this housing assembly replace a failing unit?

Install this housing to stop coolant leaks, restore correct hose routing, and ensure the thermostat or water pump connections seal properly. The included gasket and two mounting holes make it straightforward to swap with the original housing when bolting points and port orientations match.

• Includes gasket/seal so no separate seal purchase is required.
• Two mounting holes match factory locations for a secure fit.
• Outlet port diameter ~1.51 inches to match OEM hoses.
• Black plastic construction resists common corrosion issues that affect metal housings.

What are the main specifications and part references to check?

Before ordering, confirm the outlet diameter, mounting hole pattern, and part cross-references to ensure compatibility. This assembly lists common OEM reference numbers so you can match it against your vehicle’s current part or service manual.

• Material: durable plastic; Color: black.
• Outlet diameter: 1.51 inch (port and outlet).
• Mounting holes: 2; includes gasket/seal for installation.
• Cross-reference numbers: CH6001, 902-5866, 9025866, 86001, CO34804, 06H121121K, 06H121121L.

Will this part come with a warranty and how reliable is it?

A-Premium backs this thermostat housing assembly with a one-year unlimited-mileage guarantee, offering protection against manufacturing defects. The warranty, combined with the supplied gasket and OEM-style ports, helps simplify replacement and provides confidence after installation.

• One-year unlimited-mileage warranty from A-Premium.
• Sold as a complete housing assembly with included seal for immediate installation.
• Quality control aimed at matching OEM fit and function for covered models.

Who is this for: This A-Premium thermostat housing assembly is intended for DIYers and professional mechanics repairing cooling systems on compatible Audi and Volkswagen models with the 2.0L L4 engines. Choose this part if your vehicle shows coolant leaks at the housing, if the hose outlets are damaged, or if you're replacing the thermostat/water-pump area and need a direct-fit OEM-replacement style housing with included gasket and verified part references.