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Quality Used OEM A/C Compressor
At FirstChoice Used Auto Parts, we supply premium-quality used OEM A/C compressors for all makes and models, helping you restore your vehicle’s air conditioning system at a fraction of the cost. Each compressor is thoroughly tested for pressure, performance, and clutch operation to ensure cold, consistent airflow and long-term reliability. Whether you’re dealing with a failing compressor or no cool air, our inventory includes dependable, budget-friendly units shipped fast across the USA. Backed by warranty and expert support, we make it easy to stay cool on the road again.
⚠️ Important Technical Notice
AC compressor replacement requires proper handling of refrigerant, which is regulated by the EPA. Professional installation is strongly recommended. The AC system must be properly evacuated and recharged with the correct type and amount of refrigerant and oil. Failure to follow proper procedures can result in system damage, poor performance, and potential environmental violations.
OEM Used AC Compressors with Warranty
At FirstChoice Used Auto Parts, we specialize in high-quality used AC compressors for all makes and models. Whether you need a replacement for your car, truck, SUV, or commercial vehicle, we have you covered with a wide selection of OEM air conditioning compressors in various configurations. With nationwide shipping across the USA, finding reliable, tested, and budget-friendly cooling components is quick and easy.
Each AC compressor undergoes rigorous inspection to ensure proper operation, clutch engagement, and overall condition. Our dedicated team is ready to assist you in finding the exact AC compressor you need—affordable, dependable, and built to perform!
Understanding Vehicle AC Compressors
The AC compressor is the heart of your vehicle’s air conditioning system, responsible for pressurizing and circulating refrigerant through the system. This critical component enables the heat exchange process that cools the air in your vehicle’s cabin, making those hot summer drives comfortable.
The basic components of a vehicle AC compressor include:
- Compressor Body: Houses the internal compression mechanism
- Clutch Assembly: Engages and disengages the compressor from the engine drive
- Pulley: Connects to the engine’s drive belt
- Shaft Seal: Prevents refrigerant and oil leakage
- Suction and Discharge Ports: Where refrigerant enters and exits the compressor
- Pressure Relief Valve: Protects against excessive pressure
- Control Valve: Regulates refrigerant flow in variable displacement compressors
The AC compressor works by taking low-pressure refrigerant gas from the evaporator and compressing it into a high-pressure, high-temperature gas. This compressed refrigerant then flows to the condenser, where it releases heat and condenses into a liquid. The liquid refrigerant then passes through an expansion valve, which reduces its pressure and temperature dramatically before it enters the evaporator inside your vehicle, where it absorbs heat from the cabin air, cooling it before returning to the compressor to repeat the cycle.
Piston (Reciprocating) Compressors
Piston compressors use pistons driven by a swash plate or wobble plate to compress refrigerant.
Key features of piston compressors:
- Design: Uses pistons moving in cylinders to compress refrigerant
- Durability: Robust and long-lasting when properly maintained
- Performance: Good compression efficiency
- Noise Level: Can be noisier than other types
- Common Issues: Valve plate failures, seal leaks
- Vehicle Applications: Common in many older and some current vehicles
Scroll Compressors
Scroll compressors use two interlocking spiral-shaped scrolls to compress refrigerant.
Key features of scroll compressors:
- Design: One fixed scroll and one orbiting scroll compress refrigerant
- Efficiency: Higher efficiency than piston types
- Noise Level: Quieter operation with less vibration
- Reliability: Fewer moving parts, potentially longer lifespan
- Common Issues: Scroll wear, bearing failures
- Vehicle Applications: Common in many modern vehicles
Rotary Vane Compressors
Rotary vane compressors use a rotor with sliding vanes to compress refrigerant.
Key features of rotary vane compressors:
- Design: Rotating vanes in an eccentric chamber compress refrigerant
- Size: Compact design
- Complexity: Fewer moving parts than piston types
- Efficiency: Good efficiency at lower pressure ratios
- Common Issues: Vane wear, oil circulation problems
- Vehicle Applications: Less common in modern vehicles
Variable Displacement Compressors
Variable displacement compressors can adjust their output based on cooling demand.
Key features of variable displacement compressors:
- Design: Can vary displacement through swash plate angle changes
- Efficiency: Excellent efficiency across operating conditions
- Engine Load: Reduces parasitic load on the engine
- Control: May use mechanical or electronic control
- Common Issues: Control valve failures, internal leakage
- Vehicle Applications: Increasingly common in newer vehicles
Why Choose FirstChoice Used Auto Parts?
At FirstChoice Used Auto Parts we began as a passinate venture in the Used Auto Parts industry. Today, we proudly serve a broad customer base across the United States, offering top-quality used auto parts at unbeatable prices. our commitement to excellence ensures that you get the best value for your money.
Frequently Asked Questions - Used Transmission
What does an AC compressor do in a vehicle?
An AC compressor is the heart of a vehicle’s air conditioning system. It pressurizes and circulates the refrigerant through the AC system, enabling the heat exchange process that cools the air. The compressor takes low-pressure, gaseous refrigerant from the evaporator and compresses it into a high-pressure, high-temperature gas. This compression process adds energy to the refrigerant, raising its temperature above that of the outside air. The hot, pressurized refrigerant then flows to the condenser, where it releases heat to the outside air and condenses into a liquid. This liquid refrigerant then passes through an expansion valve or orifice tube, which reduces its pressure and temperature dramatically. The cold refrigerant then flows through the evaporator inside the vehicle, absorbing heat from the cabin air and cooling it before returning to the compressor to repeat the cycle. The compressor is typically belt-driven by the engine and includes a clutch mechanism that engages and disengages the compressor as needed to maintain the desired temperature. Without a functioning compressor, the refrigerant cannot circulate properly, and the air conditioning system will not produce cold air.
How do I know if my AC compressor needs replacement?
Signs that your AC compressor may need replacement include warm air blowing from the vents when the AC is set to maximum cooling, which is the most common symptom of compressor failure. You might hear unusual noises when the AC is running, such as grinding, squealing, or rattling, which can indicate internal damage to the compressor. Visible fluid leaks under the vehicle (often with an oily appearance and located near the front of the engine) can suggest refrigerant leaks from the compressor or its connections. If the compressor clutch is not engaging (you can observe this by looking at the front of the compressor while someone turns on the AC), it may indicate electrical problems or clutch failure. Difficulty starting the compressor or intermittent cooling can also suggest compressor issues. In some cases, the AC system may blow cold air initially but then gradually warm up as you drive, indicating the compressor is cycling on and off abnormally. Circuit breaker or fuse issues related to the AC system can sometimes be traced back to a failing compressor drawing too much power. If your vehicle has high mileage (over 100,000 miles) and the AC performance has gradually declined, compressor wear is a common cause. Any visible damage to the compressor itself, such as corrosion, oil stains, or physical damage, is a clear indicator of potential problems.
What's the difference between different types of AC compressors?
Vehicle AC compressors come in several different designs, each with unique characteristics. Piston compressors (also called reciprocating compressors) use pistons driven by a swash plate or wobble plate to compress refrigerant. They’re durable and common in many vehicles but can be noisier than other types. Scroll compressors use two interlocking spiral-shaped scrolls to compress refrigerant, with one scroll remaining stationary while the other orbits around it. They’re known for smooth, quiet operation and efficiency, and are common in many modern vehicles. Rotary vane compressors use a rotor with sliding vanes to compress refrigerant. They’re compact and have fewer moving parts but are less common in modern vehicles. Variable displacement compressors can adjust their displacement (the amount of refrigerant compressed per revolution) based on cooling demand, improving efficiency and reducing engine load. They’re increasingly common in newer vehicles for better fuel economy. Electric compressors are powered by an electric motor rather than the engine belt, making them ideal for hybrid and electric vehicles that may not always have the engine running. They offer precise control but require specific electrical system compatibility. The type of compressor used varies by vehicle manufacturer, model, and year, and they are not typically interchangeable without significant system modifications. When replacing a compressor, it’s essential to match the correct type and specific model for your vehicle to ensure proper fit and function.
Will a used AC compressor fit my specific vehicle?
AC compressor compatibility depends on your vehicle’s year, make, model, and sometimes engine size or trim level. The compressor must match in mounting points, pulley size, clutch type, and refrigerant system specifications. Even within the same model, different engine options might require different compressors. The compressor must be compatible with your vehicle’s refrigerant type (R134a, R1234yf, or older R12 systems). The electrical connections and pressure switch configurations must match your vehicle’s wiring harness. The compressor’s displacement and capacity should be appropriate for your vehicle’s cabin size and cooling requirements. The pulley and belt configuration must align with your engine’s accessory drive system. Port locations and sizes must match your vehicle’s refrigerant lines. Some vehicles have specific control valve requirements for variable displacement compressors. Our team can help ensure you get the correct AC compressor for your specific application. When ordering, having your VIN number available can help us confirm the exact specifications needed for your vehicle. This attention to detail ensures you receive an AC compressor that fits and functions properly in your vehicle, maintaining proper cooling performance without causing damage to other system components.
Are your used AC compressors tested before sale?
Yes, all our used AC compressors undergo thorough inspection and testing before sale. We check for smooth operation by verifying the compressor shaft turns freely without binding or excessive resistance. We inspect the clutch assembly for proper engagement and disengagement, and test the electrical components including the clutch coil for correct resistance and function. We examine all mounting points, brackets, and hardware for damage or excessive wear. We inspect the compressor body for cracks, damage, or oil leaks that could indicate internal problems. We check all port openings and seals for damage that could lead to refrigerant leaks. We verify that the pulley rotates smoothly without wobble or bearing noise. For variable displacement compressors, we test the control valve function when possible. We also check for signs of contamination or debris that could indicate previous system failure. This comprehensive testing ensures you receive a reliable, functional AC compressor that meets our high standards. All AC compressors come with our standard 30-day warranty for your peace of mind.
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