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<h2>What does an AC compressor do in a car?</h2>Although the air conditioning (A/C) system in your car is made up of a variety of components, the compressor is one of the critical components that develop the system's essential cycle. Without it, your complete A/C system won't be able to produce cool air inside the car, which is its primary job. The <a href="/blogs/understanding-different-types-of-car-ac-compressors-and-how-they-work">AC compressor's function</a> is to compress the refrigerant in the automobile to the correct pressure to activate its heat-transfer properties and adjust temperatures. Doing this lets you keep cool in the summer and have a clear windshield in the winter.<h2>How does an A/C compressor work?</h2>The AC compressor is responsible for circulating that refrigerant gas all throughout the different components to make the cooling happen.&nbsp;It takes in that refrigerant gas after it's come through the evaporator. This refrigerant is in a low-pressure, low-temperature state at this point. But then the compressor squeezes and compresses the heck out of it, which jacks up the pressure and temperature of the gas dramatically.Now that hot, high-pressure refrigerant gas gets pushed out of the compressor and over to the condenser. In the condenser, all that heat gets released and the gas condenses back into a high-pressure liquid form. From there, the liquid refrigerant goes through an expansion valve, which drops the pressure and temperature even further before it reaches the evaporator.Inside the evaporator, that cold, low-pressure refrigerant absorbs heat from the cabin air, causing it to evaporate back into a gas. And that's the cooled air that gets blown into the car's interior. Then the low-pressure gas cycles back to the compressor to start the whole process over again.<h2>Car AC compressor failure symptoms</h2><a href="/blogs/how-to-fix-a-noisy-car-ac-compressor">Car AC compressor failures</a> are crucial for vehicle owners to be aware of. AC compressor failure can lead to discomfort, especially during hot weather, and addressing the issue promptly can prevent further damage and costly repairs. Recognizing the following signs allows you to take preventive action before the situation worsens:<ul><li>Warm air: The air blowing from your AC vents is warm rather than cool, indicating a lack of proper cooling refrigerant circulation.</li><li>Strange noises: Unusual noises, such as grinding, squealing, or rattling, when the AC is turned on can indicate compressor issues.</li><li>Vibration: Excessive vibration or shaking felt when the AC is engaged may suggest a problem with the compressor.</li><li>AC clutch not engaging: If the AC clutch, the component responsible for engaging and disengaging the compressor, doesn't activate, cooling won't occur.</li><li>Leaking refrigerant: A sudden loss of refrigerant or visible leaks around the compressor can point to compressor failure.</li><li>Belt issues: Damaged or loose belts connected to the compressor can result in cooling problems and unusual sounds.</li><li>Reduced cooling performance: If the AC provides weaker cooling performance than usual, the compressor may not be functioning optimally.</li><li>Electrical issues: Malfunctions in the electrical circuitry connected to the compressor can disrupt its operation.</li><li>Burnt smell: A burnt or unusual smell when the AC is on might indicate compressor overheating.</li><li>Excessive cycling: Rapid on-off cycling of the compressor can indicate problems with its internal components.</li><li>Dashboard warning lights: Some vehicles have warning lights that illuminate when there's an issue with the AC system, including the compressor.</li><li>Higher engine temperature: AC compressor issues can lead to additional load on the engine, resulting in higher operating temperatures.</li></ul>

AC Compressor

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Air Cleaner

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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 Hose

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Air Intake Manifold Actuator Control Solenoid

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Air Intake Manifold Flap Adjuster

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Air Intake Manifold Runner Control Sensor

Air Intake Resonator

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Electric Vacuum Pump

Engine Air Duct Assembly

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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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Intake Manifold Repair Bracket

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Intake Manifold Runner Control Valve

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Intercooler

Intercooler Hose

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Oxygen Sensor

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Pressure Sensor

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Supercharger Pulley Drive Unit

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Supercharger Snout Rebuild Kit

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Throttle Body

Throttle Cable

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Throttle Position Sensor

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Turbocharger

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Turbocharger Gasket Kit

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Turbocharger Oil Line

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Vacuum Pump

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Air Filters & Intake Systems

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Camshaft Adjuster

Camshaft Adjuster Cover

Camshaft Kit

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Camshaft Timing Gear

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Camshafts

Chain Tensioner Adjuster

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Cylinder Head

Cylinder Head Assembly

Eccentric Shaft Actuator

Engine Timing Belt

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Engine Valve Cover

Engine Valve Cover Gasket

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Harmonic Balancer

Rocker Arm

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Rocker Arm Shaft Lifter Assembly

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Timing Belt Kit

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Timing Chain Gear

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

Valve Cover Gasket

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Valve Lifter Guides

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Valve Lifters Tappet

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Cams, Timing & Valvetrain

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Belt Tensioner

Coolant Level Sensor

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Crank Installer Tool

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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

Crankshaft Pulley

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Engine Oil Dipstick

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Engine Oil Dipstick Tube

Engine Oil Filter

Engine Oil Pan Gasket

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Flywheel

Harmonic Balancer Crankshaft Hub

Knock Sensor

Oil Baffle

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Oil Cooler

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Oil Cooler Line

Oil Drip Pan

Oil Filler Cap

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Oil Filter

Oil Filter Base

Oil Filter Cover

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Oil Filter Housing

Oil Filter Housing Cover

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Oil Level Sensor

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Oil Pan

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Oil Pump

Oil Pump Drive Gear Shaft

Oil Pump Pickup Tube

Oil Separator

Serpentine Belt

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Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

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Electronic Ignition System

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Glow Plug

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Glow Plug Relay Module

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Ignition Coil

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Ignition Coils & Wires Kits

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Ignition Distributor

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Kill Switch

Knock Detonation Sensor

Relay

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Spark Plug

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Pulley

Engine Components & Accessories

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Active Grille Shutter Actuator

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Auxiliary Water Pump

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Electric Engine Water Pump

Engine Coolant Air Bleeder Valve

Engine Coolant Pipe

Engine Coolant Shut Off Valve

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Expansion Tank

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Expansion Tank Mounting Plate

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Fan Pulley Bracket

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Fuel Cooler

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Overflow Hose Connector

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Engine Cooling

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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.

BMW 840i AC Compressor