Vehicle & Equipment · Driver Training VideoReefer Operation Basics

A refrigerated trailer isn't just a box with a fan bolted on the front — it's cargo protection, and you're the last set of eyes on it before it reaches a customer who will reject a load over two degrees.

Start every trip with the reefer, not just the tractor. Check its fuel tank — the unit burns diesel on its own schedule, separate from the truck, and running dry mid-route ruins a load. Check oil level, belts, and the condenser coils for debris.

Confirm the setpoint matches the bill of lading — not what you assume the product needs. Frozen freight typically runs around minus ten degrees Fahrenheit; chilled and fresh freight typically runs in the mid-thirties.

Pre-cool the box before it's loaded — thirty to sixty minutes at setpoint — so product goes into a cold trailer instead of cooling down a warm one.

Loading matters as much as the unit. Product should already be at temperature before it goes on. Leave the air chute clear at the nose, keep load height below the return-air line, and pattern the pallets so air can reach the back doors.

Check product temperature with a probe at pickup, not just the return-air display. The two can disagree, and the probe reading is what protects you if a claim comes back on the load.

On the road, walk the unit at every stop. Listen for the compressor cycling normally, check the fuel gauge, and glance at the display for alarm codes. Catch a problem two hours from a fix, not two hours from a rejected load.

If the unit alarms or the temperature drifts, call it in immediately. Early notice gives dispatch and the customer options; a surprise at the dock gives them a rejected load and gives you the blame.