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Fit For BMW Fit For audi Air conditioning Charge cold medium interface valve core. The valve core provides a tight seal to prevent R134a or R1234yf refrigerant from leaking out of the AC system. Essential for maintaining cooling performance and system pressure. The thermostat expands or contracts in response to temperature changes to open or close the valve. When the engine is cold, the thermostat remains closed, allowing coolant to recirculate within the engine for rapid warm-up.