INFINITI 591-73638 Temperature Ac Control Amplifier Module

( Brand: Infiniti ), ( Part Type: Ac Control Amplifier Module ), ( Oe/oem Part Number: 277603ja5b ), ( Ipn: 591-73638 ), ( Manufacturer Warranty: 90 Day ), ( Warranty Length: 90 Day Warranty )

Review INFINITI Nissan Temperature Ac Control Amplifier Module Oem fits PATHFINDER QX60 2014

The **Infiniti 591-73638 2014 QX60/Nissan Pathfinder Temperature AC Control Amplifier Module** is a critical electronic component designed to regulate and optimize the climate control system within these luxury SUVs. This high-performance module serves as the central hub for managing the vehicle s air conditioning, heating, and ventilation functions, ensuring precise temperature regulation, airflow distribution, and defrosting capabilities. Engineered with advanced circuitry and robust construction, the amplifier module interfaces seamlessly with the vehicle s climate control panel, translating driver inputs into precise commands for the HVAC system. It integrates with sensors throughout the cabin such as temperature, humidity, and airflow sensors to maintain optimal comfort levels while minimizing energy consumption. The module also plays a vital role in coordinating the operation of the blower motor, air mix doors, and refrigerant flow, ensuring smooth transitions between heating and cooling modes. Built to withstand the demands of daily use, this component is designed for long-term reliability, featuring a durable housing and high-quality internal components that resist wear and environmental factors. Whether installed in the **Infiniti QX60** or the **Nissan Pathfinder**, this amplifier module is essential for maintaining a comfortable, climate-controlled environment, enhancing passenger comfort and overall driving experience. Replacement of this module is often necessary when symptoms such as erratic temperature control, HVAC system malfunctions, or error codes related to climate control appear, ensuring the vehicle s HVAC system operates efficiently and effectively.

**Pros and Cons of Buying a Used Infiniti QX60 (2014) with the Specified AC Control Amplifier Module (Part # 591-73638)**

### **Pros**

1. **Reliability of the QX60 Platform** The 2014 Infiniti QX60 is based on Nissan s solid CVT transmission and front-wheel-drive architecture, which is known for durability in its class. Many owners report few major issues beyond routine maintenance.

2. **Comfort and Space** The QX60 offers a spacious, comfortable cabin with good seating for passengers and cargo capacity, making it practical for families or those needing extra room.

3. **Infiniti s Brand Reputation** Infiniti has historically focused on luxury and refinement, and the QX60 delivers a smooth ride and decent sound insulation compared to some competitors.

4. **Potential for Cost Savings** Purchasing a used vehicle with a known part (the AC control amplifier) can be cheaper than buying new, especially if the rest of the vehicle is in good condition.

5. **Aftermarket Support** The QX60 has a dedicated following, and parts like the AC control amplifier are relatively common, making repairs or replacements easier to source.

6. **CVT Transmission Performance** While CVTs have faced criticism, Nissan s implementation in the QX60 is generally smooth and reliable if properly maintained, avoiding harsh shifts or jerkiness.

7. **Infotainment and Tech Features** The 2014 model includes a decent infotainment system (though not as advanced as later models) with Bluetooth, USB, and basic navigation, which is functional for daily use.

---

### **Cons**

1. **AC Control Amplifier Module Issues** The **591-73638 AC control amplifier** is a known weak point in some Infiniti/Nissan models, particularly in older QX60s. Symptoms include:

- **Intermittent AC failure** (blower motor not responding, temperature fluctuations).

- **Error codes** (e.g., P0850, P0851) related to AC system malfunctions.

- **Electrical gremlins** (fuse blowing, wiring harness failures).

- **High repair costs** if the module fails, as replacements can range from **$300 $600** (parts labor). Some owners report needing to replace the entire AC control unit or related wiring.

2. **CVT Transmission Concerns** While generally reliable, CVTs are more complex than traditional automatics and can develop **slippage, overheating, or fluid degradation** over time. Regular fluid changes are critical, but many owners neglect this, leading to premature failure.

3. **Infotainment Glitches** The **2014 QX60 s infotainment system** (likely a basic touchscreen with a backup dial) can be **slow, unresponsive, or prone to software freezes**, especially if not updated by the dealership.

4. **Rust and Corrosion Risks** Depending on the region, the QX60 may suffer from **underbody rust** (especially in snowy or salted areas). A thorough inspection of the wheel wells, rocker panels, and frame rails is essential.

5. **Resale Value and Depreciation** Luxury SUVs like the QX60 depreciate quickly, and the **2014 model is already outdated**. If you plan to sell later, you may not recover much of the investment.

6. **Maintenance Costs** While not excessively expensive, **Nissan/Infiniti parts and labor can be costly** compared to Japanese competitors like Toyota or Honda. Independent mechanics may charge premium rates for Infiniti work.

7. **Potential Hidden Problems**

- **Water pump failure** (common in CVT-equipped Nissans).

- **Suspension wear** (struts, bushings, or ball joints may need replacement).

- **Electrical issues** (faulty sensors, wiring harnesses, or fuse boxes).

---

### **Ending Conclusion**

- The **AC system is fully functional** (no history of intermittent failures).

- The **CVT fluid has been recently changed** (preferably within the last 60,000 miles).

- The **vehicle has been well-maintained** (service records available).

- You **budget for potential AC or electrical repairs** (expect at least **$300 $600** for the amplifier if needed).

- You **inspect the undercarriage for rust** and test all electronics thoroughly.

However, if the **AC control amplifier has a history of failures** or the seller is unwilling to provide maintenance records, the **risks outweigh the benefits**. The QX60 is a **solid but aging luxury SUV**, but its **electrical quirks (especially AC-related) and CVT reliability concerns** make it a **high-risk purchase for the average buyer**.

---

### **Recommendation**

- **Get a pre-purchase inspection (PPI) from a Nissan/Infiniti specialist** to confirm the AC system and CVT are in good shape.

- **Test the AC thoroughly** Run it at different temperatures and speeds to check for inconsistencies.

- **Verify maintenance history** Look for **CVT fluid changes, timing belt service (if applicable), and AC compressor checks**.

- **Budget for contingencies** Set aside **$1,000 $2,000** for unexpected repairs (AC, CVT, suspension).

- **Consider alternatives** A **2015 QX60** (with updated electronics) or a **Toyota Highlander/Lexus RX** (if reliability is a priority) may be safer long-term.

- **Avoid the purchase** unless you re prepared to **immediately replace the module** and have proof it was working before the sale.

- **Look for a QX60 with a different AC control unit** (e.g., **591-73639 or later models**) if available.

- A **CPO QX60 with a warranty** eliminates much of the risk, though even CPO vehicles may have hidden CVT or electrical issues.

**Final Verdict:** The **2014 QX60 is a capable but high-maintenance luxury SUV**, and the **AC control amplifier is a weak point**. Only proceed if you re **comfortable with potential electrical repairs** and have **verified the vehicle s history**. Otherwise, consider a **more reliable alternative** or a **newer QX60 model** with fewer known issues.

Details:

This will fit: Nissan Pathfinder 2014 - 2014 Temperature; AC amplifier control, dash, 2.5L 4 cylinder, Hybrid, Infiniti QX60 behind radio, Hybrid.

specifications nssnheatcontrol:

• for models: Qx60, Pathfinder
• for makes: Nissan, Infiniti
• for years: 2014
• brand: Infiniti
• part type: Ac Control Amplifier Module
• oe/oem part number: 277603ja5b
• ipn: 591-73638
• manufacturer warranty: 90 Day
• warranty length: 90 Day Warranty

payments nssnheatcontrol:

• other
• wallet: Paypal
• credit card: Visa

seller nssnheatcontrol:

• city: North Las Vegas, Nevada
• rating: 98.2%
• # reviews: 493210

general nssnheatcontrol:

• Car Truck Parts Accessories > Air Conditioning Heating > HVAC Controls Control Units
• condition: Used

returns nssnheatcontrol:

• policy: Returns Accepted
• time: 30 Days
• paid by: Buyer

offer nssnheatcontrol:

• started: February 24, 2026
• availability: In Stock
• quantity: 1
• options: Ship-to-home
• sold: 0

shipping nssnheatcontrol:

• cost: $0.00
• class: Standard
• service: UPS Ground
• transit: 3-8 Days
• carrier: UPS
• type: Fixed

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