The Expansion device is one of the main components in your BMW A/C system. It regulates the flow of gas inside the A/C system and it controls the flow of refrigerant. You can control the temperature in your car using your A/C system. According to what temperature you desire it to be, the car A/C system will act accordingly. If you want the A/C system to get colder, the Expansion valve expands and releases more refrigerant through the system. If you prefer it to be not as cold, the Expansion valve shrinks and slows down the release of refrigerant.
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