Coolant Control Valve 4H0121671D

IMAGE IS EXAMPLE ONLY, BRAND MAY VARY

A coolant control valve, also known as a heater valve, is an important component in a car's cooling system. Its primary function is to control the flow of coolant to the heater core, which in turn regulates the level of heat inside the vehicle cabin. The valve is typically located near the engine and connects to the heater hoses. When the valve is open, coolant flows through the heater core and warms up the air that circulates through the vents, providing warmth to the occupants.

The coolant control valve is designed to be controlled by the car's heating system. In modern cars, it is often operated electronically by the climate control system, allowing precise regulation of the coolant flow based on the desired temperature settings. When the heater is turned off, the valve closes, preventing the flow of coolant to the heater core. This helps to maintain a comfortable temperature inside the vehicle, as well as preventing overheating issues that could occur if the coolant was continuously flowing through the heater core.