Charlotte Mobile Diesel offers reefer unit repair through independent technicians who also handle trailer repair, mobile diesel truck repair, roadside calls and fleet PM around Charlotte.
A refrigerated trailer that can't hold setpoint puts the whole load at risk. Charlotte's role as a food and grocery distribution hub — with large cold-storage operations on the west side and along I-85 — means a lot of reefers sitting at docks, and a lot of pressure to fix them fast.
Units serviced
- Diesel-driven trailer refrigeration units from the major manufacturers
- Truck-mounted units on straight trucks
- Hybrid and electric-standby capable units
- Multi-temp units with remote evaporators
Typical reefer failures
Starting and engine
Reefer units have their own small diesel engine, battery and fuel filters. Dead batteries, glow-plug faults and clogged filters cause most no-start alarms.
Belts and airflow
Worn belts, failed idlers and iced or dirty evaporator coils reduce airflow and pull-down performance.
Controller and sensors
Return-air and discharge-air sensor faults, defrost termination problems and controller alarms are read and cleared through the unit's display or service software.
Refrigeration circuit
Low refrigerant, leaks and compressor issues. Any work that opens the refrigerant circuit requires an EPA Section 608–certified technician and proper recovery equipment.
Service steps
- Download the unit's alarm and temperature log.
- Run a pre-trip inspection (PTI) cycle.
- Repair the fault and verify pull-down to setpoint.
- Record readings so the carrier has documentation for the shipper.
Refrigerants, parts and durability
Older units commonly run R-404A; many newer units use lower-GWP blends such as R-452A. Never top off with a different refrigerant. Change the unit's oil, fuel and air filters at the hour meter interval, keep condenser coils clean, and replace door seals on the trailer — a leaky door makes even a healthy unit run constantly.