Heater Valve – 4H0 121 671D (HEPU)

Description

Product Description

The 4H0 121 671D Heater Valve is a genuine‑spec heater control valve used on various Audi models. Mounted in the heater coolant circuit, this valve regulates the flow of hot coolant to the heater core, allowing the climate control system to deliver stable and adjustable cabin heat.

When this valve begins to fail, you may notice inconsistent cabin heat, no heat on one side, temperature fluctuations, or small coolant leaks around the valve body or hose connections. Replacing it with a correct 4H0121671D heater valve restores proper coolant flow through the heater core and keeps the HVAC system working as intended.

• OEM reference: 4H0 121 671D
• Function: Heater control valve / coolant shut‑off valve
• Precisely meters coolant flow to the heater core for accurate cabin temperature control
• Designed for proper sealing at hose connections to prevent leaks
• Direct‑fit replacement built to OE specifications for long‑term reliability

(Always confirm compatibility by VIN or by matching the original part number before ordering.)

Cross Reference

• P188800
• P1888
• 4H0 121 671B

Additional information

No fitment data available.