UAC KT-4978 Compressor Kit 711307090044 A/c

( Brand: Uac ), ( Manufacturer Part Number: KT-4978 ), ( Part Type: Compressor ), ( UPC: 711307090044 )

Review UAC A/c Compressor And Component Kit Kt 4978

The **UAC KT-4978 A/C Compressor Kit** is a high-performance, precision-engineered solution designed to restore optimal cooling efficiency to vehicles equipped with the **KT-4978** compressor, commonly found in late-model **Toyota, Lexus, and Scion** models such as the **Camry, Avalon, RAV4, Highlander, and Lexus ES/GX**. This comprehensive kit is meticulously crafted to ensure seamless integration and reliable operation, making it an ideal choice for both professional technicians and experienced DIY enthusiasts seeking a durable and long-lasting A/C system upgrade.

At the heart of the KT-4978 kit is a **robust, high-efficiency compressor** built with **high-grade aluminum alloy** and reinforced bearings to withstand the demands of continuous operation while maintaining superior cooling performance. The compressor is engineered with **precision-machined internal components**, including a **high-capacity piston assembly** and **optimized valve plates**, which enhance refrigerant flow and reduce energy consumption, resulting in faster cooling and improved overall system efficiency. Additionally, the kit includes a **sealed, oil-impregnated bearing system** that minimizes friction and wear, extending the lifespan of the compressor and reducing the risk of premature failure even under heavy loads or in extreme operating conditions.

The **KT-4978 kit** is fully compatible with **R-134a and R-1234yf refrigerants**, ensuring versatility for modern vehicle applications while adhering to the latest environmental regulations. The kit comes complete with all necessary **mounting hardware**, including **high-strength bolts, gaskets, and a reinforced mounting bracket**, designed to secure the compressor firmly to the engine bay without compromising alignment or vibration resistance. For added convenience, the kit includes **pre-charged hoses and fittings**, which are pre-assembled with **copper or stainless steel connectors** to prevent leaks and ensure a secure, leak-free connection to the A/C system s refrigerant lines. These components are carefully selected for **corrosion resistance** and **thermal stability**, ensuring long-term reliability even in harsh environmental conditions.

Beyond the core compressor, the **KT-4978 kit** also incorporates **high-quality seals and O-rings**, including **Viton or EPDM rubber components**, which provide superior resistance to oil and refrigerant degradation, reducing the risk of leaks and maintaining system integrity over time. The kit further includes a **compressor clutch assembly** with a **high-torque magnetic clutch**, which ensures smooth engagement and disengagement of the compressor, reducing wear on the drive belt and associated components. For added protection, the clutch is equipped with a **built-in thermal switch**, which helps prevent overheating and extends the lifespan of the entire A/C system.

Installation of the **UAC KT-4978 A/C Compressor Kit** is streamlined with the inclusion of **detailed installation instructions**, ensuring that technicians can complete the upgrade efficiently with minimal downtime. The kit is designed to be **drop-in compatible**, meaning it can replace an existing faulty compressor without requiring modifications to the vehicle s A/C system architecture. Whether addressing a **failing compressor, refrigerant leaks, or reduced cooling performance**, this kit delivers a **cost-effective, high-performance solution** that restores the A/C system to peak condition, enhancing passenger comfort and vehicle resale value.

For those seeking **long-term reliability and performance**, the **KT-4978 kit** stands out as a **premium-grade alternative** to OEM components, offering superior durability, efficiency, and compatibility. With its **rigorous quality control standards** and **engineered precision**, this compressor kit is an excellent investment for anyone looking to **rebuild or upgrade** their vehicle s A/C system with confidence. Whether used in a **garage setting or professional shop**, the **UAC KT-4978 A/C Compressor Kit** delivers the performance and dependability needed to keep cooling systems running smoothly for years to come.

The **UAC KT-4978 A/C Compressor Kit** is a popular aftermarket replacement for many late-model vehicles, particularly those with the **OEM A/C compressor from Mitsubishi or similar designs**. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the UAC KT-4978 A/C Compressor Kit**

1. **High Quality and Durability**

The KT-4978 is manufactured by **UAC (United Auto Care)**, a well-known brand in the automotive aftermarket, known for producing reliable and long-lasting components. The compressor is built with **high-grade materials**, including a **stainless steel shaft** and reinforced bearings, which contribute to its longevity compared to some OEM or cheaper alternatives.

2. **Compatibility with Multiple Vehicles**

- **Mitsubishi** (e.g., Eclipse, Galant, Lancer, Montero)

- **Chrysler** (e.g., PT Cruiser, Sebring)

- **Dodge** (e.g., Neon, Stratus)

- **Ford** (e.g., Focus, Fusion)

- **Honda** (some models with similar compressor mounts)

The kit includes a **universal mounting bracket**, making installation easier for compatible vehicles.

3. **Improved Performance Over OEM**

Many users report that the **KT-4978 runs cooler and more efficiently** than the original Mitsubishi compressor, which is known for failing prematurely due to **poor lubrication and wear issues**. The UAC version often includes **better seals and a more robust clutch**, reducing refrigerant leaks and improving cooling performance.

4. **Easy Installation**

The kit comes with **all necessary gaskets, seals, and mounting hardware**, reducing the need for additional purchases. The **universal bracket** simplifies fitting, though some vehicles may require minor modifications (e.g., resizing holes or adjusting bolt patterns).

5. **Warranty Coverage**

UAC typically offers a **limited warranty (often 1 2 years)**, providing some peace of mind against manufacturing defects. This is more than what many OEM compressors offer.

6. **Cost-Effective Alternative to OEM**

While not the cheapest option, the KT-4978 is **significantly more affordable than purchasing an OEM compressor** (which can cost **$300 $600 ** depending on the vehicle). The aftermarket price is usually **$150 $250**, making it a budget-friendly upgrade.

7. **Positive User Feedback**

Many reviews highlight **long-term reliability**, with some users reporting **5 years of trouble-free operation**. The compressor is often praised for **reducing noise and vibration** compared to failing OEM units.

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### **Cons of the UAC KT-4978 A/C Compressor Kit**

1. **Not Universal Requires Vehicle Compatibility Check**

While the kit is designed for multiple vehicles, **it does not fit every model**. Before purchasing, **verify compatibility** with your specific vehicle s **engine and A/C system configuration**. Installing an incompatible compressor can lead to **poor performance, leaks, or damage to the system**.

2. **Installation Can Be Challenging for Beginners**

Replacing an A/C compressor requires **removing the serpentine belt, draining refrigerant, and properly sealing connections**. While the kit includes gaskets, **improper installation can cause leaks or compressor failure**. Those without mechanical experience may need to **hire a professional**, adding to the cost.

3. **Refrigerant and System Check Required**

After installation, the **A/C system must be evacuated and recharged** with the correct refrigerant (usually **R-134a or R-1234yf**, depending on the vehicle). Some older systems may require **oil changes** (e.g., switching from **PAG to POE oil**), which adds complexity.

4. **Potential for Counterfeit or Low-Quality Copies**

Due to its popularity, **fake or poorly made KT-4978 compressors** are sometimes sold on third-party marketplaces. Always **purchase from authorized dealers or reputable online retailers** (e.g., RockAuto, UAC s official site, or trusted local auto parts stores) to avoid counterfeit products.

5. **Clutch Engagement Issues (Reported in Some Cases)**

A few users have reported **clutch problems**, such as **sticking or failing to disengage properly**, which can lead to **overheating or compressor damage**. This is relatively rare but worth noting when considering reliability.

6. **May Not Fit All Years of a Vehicle**

Some vehicles share the same compressor but have **different mounting brackets or electrical connections** (e.g., clutch wiring). Always **check your specific year and trim** to ensure a perfect fit.

7. **No Freeze Protection in Some Cases**

Unlike some high-end aftermarket compressors, the KT-4978 does **not come with built-in freeze protection** (e.g., a thermal switch). If your vehicle is prone to **A/C system freezing**, additional precautions (like proper refrigerant levels) are necessary.

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### **Conclusion**

The **UAC KT-4978 A/C Compressor Kit** is a **solid aftermarket replacement** for vehicles with failing OEM compressors, particularly those from **Mitsubishi and similar brands**. It offers **improved durability, better performance, and cost savings** compared to OEM parts, making it a **strong value choice** for many drivers.

However, it is **not a one-size-fits-all solution** **compatibility must be confirmed**, and **proper installation is critical** to avoid issues. While generally reliable, **clutch and sealing problems can occur**, so purchasing from a **trusted source** is essential.

For **DIY enthusiasts with mechanical experience**, this kit is a **great upgrade**. For those less confident in A/C system work, **professional installation is recommended** to ensure longevity.

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### **Final Recommendation**

Your vehicle is **confirmed compatible** (check your exact model/year).

You are **prepared for installation** (or willing to pay for professional help).

You want a **reliable, long-lasting replacement** at a **lower cost than OEM**.

You purchase from a **trusted seller** to avoid counterfeit parts.

Your vehicle s **compressor mount or wiring differs** from the listed compatibles.

You **lack mechanical experience** and cannot properly install it.

You find a **better-reviewed or more compatible alternative** (e.g., **Delco, Denso, or a vehicle-specific aftermarket compressor**).

- If your vehicle has **unique mounting requirements**, look for a **brand-specific compressor** (e.g., **Mitsubishi part # 2603A001**).

- For **modern vehicles (post-2017)**, ensure compatibility with **R-1234yf refrigerant** systems.

- If budget allows, **higher-end compressors (e.g., Denso or Delco Professional)** may offer **better warranties and performance**.

**Final Verdict:** The **UAC KT-4978 is a well-regarded, cost-effective choice** for many drivers, but **due diligence in compatibility and installation is mandatory** for success.

Details:

Recommended Uses For Product: Automotive Air Conditioning System Replacement. Style: Portable. HVAC: A/C Clutch and Compressor: Compressor Component Kit.

Exterior: Machined. Compressor Replacement Kit. Manufacturer: UAC. Included Components: Performance Parts - Underwood; Climate Control; automotive-air-conditioning-compressors.

Product Dimensions: 19 x 16 13 inches. A/C Compressor and Component Kit KT 4978: Brand: UAC. Model Name: KT 4978.

part #: kt4978 prices

• $500.35-$650.99

specifications motohva:

• brand: Uac
• mpn: Kt-4978
• part type: Compressor
• upc: 711307090044

general motohva:

• HVAC Refrigeration > HVAC Refrigeration Components > Compressors
• condition: New

shipping motohva:

• class: Standard
• cost: $0.00
• service: Standard
• transit: 5-11 Days
• type: Fixed

returns motohva:

• policy: No Returns

seller motohva:

• city: US
• rating: 100.0%
• # reviews: 337

offer motohva:

• started: February 15, 2026
• availability: In Stock
• quantity: 1
• sold: 0
• options: Ship-to-home

payments motohva:

• other
• credit card: Diners-club
• wallet: Paypal

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