Water Pump & Thermostat 06H121026 For Audi A3 A4 A5 VW CC Tiguan GTI 1.8T 2.0T

Water Pump & Thermostat 06H121026 for Audi A3 A4 A5 VW CC Tiguan GTI 1.8T 2.0T

This water pump and thermostat assembly, referenced as 06H121026, is a combined cooling system replacement for Audi A3, A4, A5, and Volkswagen CC, Tiguan, and GTI 1.8T and 2.0T engines, circulating coolant and regulating operating temperature in one unit.

Overview

This water pump and thermostat assembly replaces the combined coolant pump and thermostat housing on Audi A3, A4, A5, and VW CC, Tiguan, and GTI 1.8T and 2.0T engines. The water pump keeps coolant moving through the block, head, and radiator while the integrated thermostat controls when coolant flows to regulate temperature. It is aimed at owners and shops handling a failed pump, a stuck thermostat, or a proactive cooling system refresh.

Built For Performance

• Combined water pump and thermostat housing in one assembly
• Sealed bearing and impeller designed for continuous coolant circulation
• Thermostat rated to open at the specified temperature for these engines
• Housing and gasket surfaces machined for a clean seal
• Matches the factory mounting points and hose connections
• OEM cross-reference 06H121026 for straightforward fitment checks

Fits These Machines

• for Audi A3 1.8T
• for Audi A3 2.0T
• for Audi A4 2.0T
• for Audi A5 2.0T
• for Volkswagen CC 2.0T
• for Volkswagen Tiguan 2.0T
• for Volkswagen GTI 1.8T
• for Volkswagen GTI 2.0T

On-The-Job Use

• Replacing a leaking or noisy water pump on a 1.8T or 2.0T engine
• Fixing an overheating condition caused by a stuck thermostat
• Refreshing the cooling system during a timing service
• Preventive maintenance on higher-mileage Audi and VW models

Specs At A Glance

Good To Know

Q: Do I need to replace the coolant after installing this assembly? A: Yes, the cooling system must be drained and refilled with the correct coolant for your engine, then bled to remove air pockets. Reusing old coolant or skipping the bleed step can cause overheating.

Q: Can I install this water pump and thermostat without removing the timing belt? A: On many 1.8T and 2.0T engines the pump sits behind the timing belt, so the belt often has to come off. If the belt is due for service, replacing both at the same time saves labor.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.