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<h2><span style="font-size: 18px;"><strong>C</strong><strong>ar </strong><strong>A/C</strong><strong>&nbsp;expansion valve</strong></span></h2>
<p>The expansion valve is a crucial component that plays a key role in regulating the flow of refrigerant through the car&rsquo;s AC system. It is positioned between the high-pressure and low-pressure sides of the AC system. The expansion valve acts as a valve or metering device that controls the flow of high-pressure, high-temperature liquid refrigerant from the condenser to the low-pressure side, where it can evaporate.</p>
<h2><span style="font-size: 18px;"><strong>How does an A/C expansion valve work?</strong></span></h2>
<p>As the high-pressure liquid refrigerant passes through the Expansion Valve, it undergoes a rapid pressure reduction. This causes the refrigerant to expand and transform into a low-pressure, low-temperature gas.&nbsp;The expansion of the refrigerant leads to a significant drop in temperature. This cold refrigerant gas is then circulated through the evaporator coil in the car's AC system. The cold refrigerant gas absorbs heat from the surrounding air as it passes over the evaporator coil. This process cools down the air, which is then blown into the vehicle's interior by the AC blower fan.</p>
<h2><span style="font-size: 18px;"><strong>Signs of a bad expansion valve</strong></span></h2>
<p>You should be aware of these common signs that may indicate a problem with the AC expansion valve:</p>
<ul>
<li>Insufficient Cooling: Reduced cooling from the AC system.</li>
<li>Inconsistent Temperature: Difficulty maintaining a consistent interior temperature.</li>
<li>Warm Air at Idle: Warmer air from vents when the car is idle.</li>
<li>Excessive Cooling: Overly cold air and potential freezing of the evaporator coil.</li>
<li>AC Cycling Rapidly: Frequent on/off cycling of the AC compressor.</li>
<li>Hissing or Whistling Noises: Unusual noises from the AC system.</li>
<li>AC System Pressure Abnormalities: Irregular pressure readings in the AC system.</li>
<li>Frost on the Evaporator Coil: Ice buildup on the evaporator coil.</li>
</ul>

A/C Expansion Valve

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Air Filter Box

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Air Flow Sensor

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Air Intake Duct

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Air Intake Manifold Actuator Control Solenoid

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Air Intake Manifold Flap Adjuster

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Electric Vacuum Pump

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Engine Air Filter

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Intake Manifold

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Intake Manifold Flap Actuator

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Intercooler

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Oxygen Sensor

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Pressure Sensor

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Turbocharger

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Timing Belt Kit

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

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Valve Lifters Tappet

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Engine Oil Dipstick Tube

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Oil Filter

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Camshaft Position Sensor

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Connector Plug

Distributor Cap

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Ignition Coil

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Knock Detonation Sensor

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Spark Plug Wire

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Engine Wiring Harness

Intake Manifold Repair Kit

Engine Components & Accessories

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Auxiliary Water Pump

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Expansion Tank

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Expansion Tank Mounting Plate

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Fuel Cooler

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Temperature Sensor

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Turbo Hose

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Water Coolant Pipe

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Engine Cooling

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EGR Valve

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Exhaust Manifold

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Nitrogen Oxide Sensor

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

Audi S5 Sportback A/C Expansion Valve