Understanding the Importance of Upgrading the Cooling System for High-Performance Driving

The 2019 Acura RLX is a sophisticated luxury sedan that combines comfort, technology, and performance. While it comes equipped with a reliable factory cooling system designed for everyday driving, enthusiasts who push their RLX to its limits through high-performance driving or modifications often find the stock cooling system insufficient. Upgrading the cooling system is essential to ensure optimal engine temperatures, prevent overheating, and maintain peak performance during spirited driving sessions.

Why the Stock Cooling System May Fall Short

The factory cooling system in the 2019 Acura RLX is engineered to handle typical driving conditions, including city commutes and highway cruising. However, high-performance driving—such as track days, spirited canyon runs, or extended high-speed driving—places additional thermal stress on the engine. This elevated heat generation can overwhelm the stock radiator, water pump, and cooling fans, leading to:

  • Increased engine operating temperatures
  • Reduced engine efficiency and performance
  • Potential engine damage from overheating
  • Decreased lifespan of engine components

By upgrading key components of the cooling system, you can mitigate these risks and ensure your Acura RLX remains reliable under demanding conditions.

Key Components to Upgrade in the Cooling System

When considering an upgrade for the cooling system, it is important to understand which parts have the most significant impact on cooling efficiency. Below are the critical components to evaluate and potentially upgrade for high-performance use:

1. Radiator

The radiator is the centerpiece of the cooling system, responsible for dissipating heat from the engine coolant. The stock radiator on the RLX is designed for balance between performance and cost, but it may not offer sufficient cooling capacity for modified engines or aggressive driving.

  • High-Performance Radiators: Aftermarket radiators typically use aluminum cores and have increased surface area with more cooling fins. This enhances heat dissipation, allowing the engine to maintain lower operating temperatures even under heavy load.
  • Dual-Pass Radiators: These force coolant to flow through the radiator twice, ensuring more thorough cooling before returning to the engine.
  • Lightweight Designs: Some performance radiators reduce weight compared to OEM parts, benefiting overall vehicle dynamics.

2. Electric Cooling Fans

The electric cooling fans help draw air through the radiator, especially when the vehicle is stationary or moving at low speed. Upgrading to high-flow, high-CFM (cubic feet per minute) fans can improve airflow and cooling efficiency.

  • Variable Speed Fans: These fans adjust their speed based on temperature inputs, reducing noise and energy consumption while providing adequate cooling.
  • Dual Fan Setups: Installing dual fans can improve airflow redundancy and ensure consistent cooling performance.

3. Water Pump

The water pump circulates coolant throughout the engine and radiator. A high-performance water pump with a larger impeller or improved design can increase coolant flow rate, enhancing heat transfer.

  • High-Flow Water Pumps: These pumps reduce hot spots in the engine by ensuring coolant moves efficiently through all passages.
  • Electric Water Pumps: Some enthusiasts upgrade to electric water pumps for better control and increased flow at low RPMs.

4. Thermostat

The thermostat regulates coolant flow based on temperature. Installing a thermostat with a lower opening temperature can help the engine reach optimal operating temperature faster and maintain lower temperatures during heavy driving.

5. Coolant and Hoses

Using high-quality, high-performance coolant improves heat transfer and provides better corrosion protection. Additionally, upgrading to reinforced silicone hoses can withstand higher pressures and temperatures associated with performance driving.

Steps to Upgrade the Cooling System on a 2019 Acura RLX

Upgrading your RLX’s cooling system involves careful planning and quality parts selection to ensure compatibility and reliability. Below is a step-by-step overview to guide you through the process:

Step 1: Assess Your Current Cooling System

Start by inspecting your existing cooling components for wear, leaks, or damage. Take note of any overheating symptoms such as rising temperature gauges, coolant loss, or steam during intense driving.

Step 2: Research and Select Upgraded Components

Based on your driving style and goals, choose the components that best fit your needs. For example, a track-focused RLX may benefit most from a high-capacity radiator and upgraded fans, while a street-driven vehicle might prioritize a high-flow water pump and better coolant.

Step 3: Gather Tools and Parts

Ensure you have all necessary tools including socket wrenches, screwdrivers, coolant catch pans, and safety gear. Purchase OEM-quality or reputable aftermarket parts to maintain reliability.

Step 4: Drain and Remove Stock Cooling Components

Safely drain the coolant from the radiator, disconnect hoses, electrical connectors, and mounting brackets. Carefully remove the radiator, fans, or other parts as needed.

Step 5: Install Upgraded Components

Install the new radiator, fans, water pump, thermostat, and hoses following manufacturer instructions. Double-check hose clamps, electrical connections, and mounting hardware for secure fitment.

Step 6: Refill with Performance Coolant

Fill the system with appropriate high-quality coolant mixed to the recommended ratio. Consider using coolants formulated for high heat capacity and corrosion resistance.

Step 7: Bleed the Cooling System

Remove trapped air from the system by bleeding according to Acura’s service procedures or aftermarket component instructions. Proper bleeding prevents air pockets that can cause overheating.

Step 8: Test and Monitor Performance

Start the engine and monitor temperature gauges and coolant flow. Take your RLX for a test drive, gradually increasing load and speed while observing temperatures. Confirm the upgraded system maintains stable temperatures under stress.

Additional Cooling Upgrades and Considerations

Oil Cooler Installation

For extreme performance driving, adding an oil cooler helps reduce engine oil temperatures, which is crucial for maintaining lubrication and preventing engine wear at high operating temperatures. Oil coolers complement the primary coolant system and improve overall thermal management.

Brake Cooling Enhancements

While not part of the engine cooling system, upgrading brake cooling ducts and components can prevent brake fade during high-performance driving. Maintaining optimal temperatures for all systems ensures consistent performance and safety.

Regular Maintenance and Monitoring

Upgrading your cooling system is just one part of ensuring reliability. Regularly inspect coolant levels, hoses, and radiator condition. Use temperature monitoring devices or aftermarket gauges to keep an eye on critical temperatures during spirited driving.

Benefits of a Properly Upgraded Cooling System

Investing in a high-performance cooling system for your 2019 Acura RLX delivers multiple benefits:

  • Improved Engine Reliability: Prevents overheating and associated engine damage.
  • Consistent Performance: Maintains optimal engine temperatures for peak power output.
  • Extended Component Life: Reduces thermal stress on engine parts and coolant system components.
  • Enhanced Driving Experience: Provides confidence during aggressive driving, track sessions, or long highway runs.
  • Better Resale Value: Well-maintained and upgraded vehicles often hold value better.

Common Mistakes to Avoid When Upgrading

  • Choosing Incompatible Parts: Ensure all components fit your specific model year and engine configuration.
  • Neglecting Proper Installation: Poorly installed systems can lead to leaks and failures.
  • Ignoring Cooling System Maintenance: Upgrades do not eliminate the need for regular coolant changes and system checks.
  • Overlooking Supporting Modifications: Other performance modifications may increase heat output; upgrading cooling accordingly is essential.

Conclusion

For owners of the 2019 Acura RLX who enjoy high-performance driving or have modified their vehicles for increased power, upgrading the cooling system is a critical step toward ensuring reliability and maintaining engine health. By selecting quality components, following proper installation procedures, and performing regular maintenance, you can keep your RLX running cool and strong under even the most demanding conditions.

For detailed guidance on compatible parts and professional installation services, consult with reputable Acura performance specialists or trusted aftermarket vendors. Upgrading your cooling system is an investment in the longevity and enjoyment of your Acura RLX.

Further Resources