Trailer Refrigeration Units: Maintenance Tips

Keeping trailer refrigeration units (TRUs) in top shape is crucial for businesses relying on temperature-controlled transport. Let's dive into essential maintenance tips to keep your reefer trailer running efficiently.

1. Follow a Preventative Maintenance Schedule

Routine reefer unit maintenance is the backbone of a reliable cooling system. Follow manufacturer recommendations and set a preventative maintenance schedule to check and service key components. Neglecting regular reefer trailer service can lead to major failures and expensive repairs. Essential tasks include:

• Checking engine oil and coolant levels
• Inspecting belts and hoses for wear
• Examining air filters for blockages
• Ensuring the battery is properly charged

2. Keep the Refrigeration Unit Clean

A dirty condenser coil can reduce cooling efficiency, forcing the unit to work harder and consume more fuel. A clean trailer refrigeration unit maintains better airflow and temperature consistency. To avoid this:

• Regularly clean the condenser coil using compressed air or water
• Remove debris from around the air intake
• Ensure drain lines are free from obstructions

3. Monitor Fuel and Electrical Systems

Fuel and electrical issues are common causes of reefer breakdowns. Keep your unit running smoothly with these best practices:

• Use clean, high-quality diesel fuel
• Drain fuel water separators to prevent contamination
• Inspect the alternator and electrical connections
• Test the reefer battery regularly

A failing battery or fuel issue can leave cargo vulnerable to temperature fluctuations.

4. Check the Evaporator and Fans

The evaporator coil and blower fans play a critical role in circulating cold air inside the trailer. If they’re not working efficiently, you’ll notice hot spots or uneven cooling. Regularly:

• Inspect fan motors and belts for wear
• Clear evaporator fins of dirt and frost buildup
• Ensure unrestricted airflow throughout the trailer

5. Inspect Temperature Control Systems

Temperature sensors and control units are the brains of the operation. If they’re off, your reefer won’t maintain precise temperature settings. To keep your TRU working as it should:

• Calibrate temperature sensors regularly
• Test the thermostat for accuracy
• Verify data logging systems are functioning

This prevents cargo loss due to unnoticed temperature fluctuations.

6. Maintain Proper Insulation and Door Seals

Your reefer trailer’s insulation and door seals are just as important as the cooling unit itself. A well-sealed trailer refrigeration unit keeps cold air in and hot air out. If they’re compromised, the unit will overwork to compensate for temperature leaks. Check for:

• Cracked or worn door seals and replace if necessary
• Gaps or damage in trailer insulation
• Loose hinges and latches causing air leaks

7. Keep an Eye on Alarms and Error Codes

Modern reefer units come equipped with diagnostic systems that alert operators to potential issues. Instead of ignoring warning lights, take action immediately.

• Learn to interpret reefer alarm codes
• Perform troubleshooting based on manufacturer guidelines
• Address minor issues before they escalate into major breakdowns

Staying proactive with reefer unit alarms minimizes unexpected failures.

8. Train Operators on Proper Usage

Even the best-maintained trailer refrigeration unit can fail if it’s not used correctly. Drivers should:

• Pre-cool the trailer before loading
• Avoid frequent door openings to maintain temperature stability
• Load cargo properly to allow for even airflow

Prevent Failures Before They Happen

Maintaining trailer refrigeration units isn’t just about preventing breakdowns—it’s about protecting your cargo, maximizing fuel efficiency, and ensuring on-time deliveries. A combination of preventative maintenance, routine inspections, and proper operation will keep your reefer unit running smoothly for years to come.

Need professional trailer service in Fontana, CA? JB Trailer Service has you covered. Get in touch today to keep your refrigerated fleet in peak condition!