When a chiller van stops cooling mid-route
It is the failure every food business quietly dreads, and the one nobody plans for until it happens. What the first warning actually looks like, what to do in the first thirty minutes, and how long your load really has before it stops being stock and starts being waste.
Spotting it
The first sign is rarely the alarm
Most drivers find out at the third or fourth drop, when someone at the receiving end puts a probe in a box. By then the clock has been running for an hour. These are the signs that come earlier.
The display is not the load
The gauge reads the air in the body, and air cools and warms far faster than a pallet of chicken does. A display climbing through +8 °C does not mean your stock is at +8 °C yet — and a display that looks fine after a restart does not mean the load recovered. Judge the product, not the air.
The sound changes before the number does
A working unit cycles: it runs, it stops, it runs again. A unit that has gone to a constant strained note, or fallen silent while the van is still running, has usually failed several minutes before the temperature moves enough to notice.
Frost tells you the truth
Heavy ice building on the evaporator, or frost that has suddenly gone patchy and wet when it was even before, is a unit in trouble. On a frozen load, softening at the corners of the pallet is your real alarm.
It may not be the unit at all
A chiller unit on a van usually runs off the engine or the vehicle battery. A flat battery, a slipped belt or an idling engine that has been switched off during a long drop all stop the cooling without anything being wrong with the fridge itself. Check the obvious before you write the load off.
The first thirty minutes
Do these five things, in this order
None of it requires a technician, and the order matters more than the speed.
- Keep the doors shut. This is the one people get wrong. The instinct is to open up and look, and every time you do, the cold air on the floor falls out and 45 °C air replaces it. A closed, well-loaded, pre-cooled body holds its temperature for a surprisingly long time — the load itself is the thermal mass doing the work. An opened one does not.
- Write down the time it stopped. Not the time you noticed — your best estimate of when it actually failed. Everything that follows is a decision about elapsed time, and in a dispute with a customer or an inspector, a written time is the difference between a claim and an argument.
- Call us before you improvise. 24/7 roadside assistance and a replacement vehicle are in every hire. The useful thing we can do in the first ten minutes is tell you whether it is worth waiting for a fix or whether we should send another van to transfer the load into.
- Get out of the sun. A body parked in direct Dubai sun gains heat far faster than one in a basement, under a flyover or on the shaded side of a building. Moving fifty metres buys you real time and costs you nothing.
- Probe the product, not the air. Between boxes, into the centre of the pallet, in the load that was warmest to begin with — usually whatever was loaded last. That reading is what decides everything below.
What not to do: do not keep restarting the unit hoping it catches, do not pack the load with ice unless the receiving customer has agreed to it in writing, and do not carry on with the round to “get rid of it”. Delivering stock you know has been out of temperature is the one mistake that turns a bad morning into a lost account.
The clock
How long the load actually has
The widely used food-safety rule is the two-hour / four-hour rule, and it counts time spent between about +5 °C and +60 °C — the range in which bacteria multiply fastest.
Under 2 hours above +5 °C
2 to 4 hours above +5 °C
The word doing the work there is cumulative. The clock does not reset when the cooling comes back on. Every earlier spell out of temperature counts — the twenty minutes on the loading bay this morning, the ten minutes with the shutter up at the second drop, and now this. Add them together honestly, because that total is what a food-safety inspector would add.
And the number is harsher here than the rule assumes. These thresholds were written for temperate climates; a body sitting in 45 °C Dubai summer heat crosses them faster than the same body would in a European winter. When it is genuinely hot, treat the two-hour mark as optimistic rather than generous.
By load type
What survives a failure and what does not
The same thirty minutes means very different things depending on what is in the back. These are the bands our own vans run at.
Frozen at −18 °C
The most forgiving, because it starts furthest from trouble and carries the most stored cold. A solidly frozen, tightly stacked pallet in a closed body survives a failure that would ruin chilled stock. Partial thawing is the line: refreeze only what is still hard in the middle.
Chilled at 0 to +2 °C
The tightest band on our own chiller vans, and the least forgiving. Fresh meat, fish, dairy and cut flowers start close to +5 °C and cross it quickly. This is the load where the first thirty minutes decide the outcome.
Cool at +2 to +5 °C
Produce, prepared food, catering trays and pharmaceuticals. It is already sitting at the top of the safe range, so it has almost no margin — but much of it is visibly fine long after it stopped being safe, which is exactly what makes it dangerous.
Pharmaceuticals are not food
Nothing above applies. Medicines carry their own excursion limits set by the manufacturer, and there is no rule of thumb worth trusting. Record the times and temperatures and hand the decision to the pharmacist or the supplier — it is theirs to make, not yours.
Prevention
The checks that catch a failing unit before it fails
Almost every failure we hear about gave a warning that morning. These are the checks that find it while the van is still in the yard.
Start the unit before you load, not after. A body that has been asked to reach temperature with an empty load space either gets there or it does not, and finding that out at six in the morning with the pallets still on the dock costs you twenty minutes. Finding it out at the second drop costs you the load.
Listen to the cycle. A healthy unit runs, reaches the setting, stops, and starts again a while later. A unit that never stops has either been given a setting it cannot reach or has lost some of its capacity, and on a hot day the difference between those two is academic: both mean it will fall behind once the doors start opening.
Look at the frost. An even, thin, dry layer on the evaporator is normal. Thick ice, or frost that has gone patchy and wet, says the airflow or the defrost cycle is not doing its job, and that is a fault that gets worse rather than better as the day warms up.
Check the things that are not the fridge. Dubai dust blocks a condenser faster than most operators expect, and a unit that cannot reject heat cannot make cold no matter how healthy the compressor is. A loose belt, a tired battery or an engine switched off through a long drop will all stop the cooling with nothing wrong with the refrigeration at all.
And load it so the air can move. A wall of boxes against the evaporator, a load packed hard to the roof, or a floor channel flattened with cardboard will all produce the same symptom as a failing unit: a good reading at the front and a warm load at the back. That one is not a fault, it is a loading mistake, and it is the most common cause of a “failure” we are called about.
Afterwards
Telling the customer, and what to put in writing
The hour after a failure decides whether you keep the account. Most of what matters here is administrative rather than technical.
Tell them before they find out. A customer who hears from you at nine that a load has been out of temperature is dealing with a supplier managing a problem. A customer who discovers it themselves at eleven, with a probe, is dealing with a supplier who tried to deliver it anyway. The stock is the same in both cases; the relationship is not.
Write the record while it is fresh, not at the end of the day. Your best estimate of when the cooling stopped, when you noticed, what the display read, what the product probed at and where you took the reading, where the van was parked, who you called and when. Five lines, taken at the time, are worth far more afterwards than a careful reconstruction written that evening.
Say what you are doing about the load rather than asking the customer to decide for you. If it is inside two hours it goes back into the cold chain and you deliver it. If it is between two and four it can be used today and not stored. If it is past four it is waste, and offering it to a customer with a caveat is not a kindness, it is a liability you are handing them.
Pharmaceutical and clinical loads are the exception to all of that. Do not make the call yourself: record the times and the readings and pass the decision to the pharmacist or the supplier, whose manufacturer limits govern it rather than any food rule.
Then tell us properly too. If the failure was the vehicle, we would far rather deal with it on the day, with your times and readings in hand, than hear about it a week later. What we cannot answer for is a load that went in warm, because a refrigerated body maintains the condition it is handed rather than correcting it, and the rental terms set that out plainly.
Chiller failure questions
My chiller van stopped cooling — what do I do first?
Keep the doors shut, note the time it failed, and call us. Every hire includes 24/7 roadside assistance and a replacement vehicle. Opening the body to check is the most common and most expensive first move.
How long can a chiller van hold temperature with the unit off?
Longer than most people expect if it is closed, pre-cooled and well loaded, because the load itself holds the cold — and far less if it is half empty, warm-loaded or repeatedly opened. There is no single number, which is why you probe the product rather than trusting a clock.
Can I refreeze food that has partly thawed?
If it is still hard through the centre, yes. If it has softened beyond the edges, treat it as chilled from then on and use it within the chilled timeframe rather than refreezing it.
Is the food still safe if the temperature only rose for an hour?
Under two hours above about +5 °C, chilled stock can normally go back into the cold chain. Between two and four hours it should be used the same day and not re-chilled. Past four hours it is waste. Remember the time is cumulative across the whole day, not just this one incident.
Do you provide a replacement chiller van?
Yes — a replacement vehicle is included in every hire, and it is listed on our rates page alongside 24/7 roadside assistance. Call us as early as you can; the sooner we know, the more likely the load is transferred rather than lost.
Whose fault is the lost stock?
If the failure is the vehicle, that is ours to answer for and we would rather hear about it in the first ten minutes than the next day. What we cannot cover is a load that was warm when it went in — a chiller unit holds a temperature, it does not pull one down. See our terms.
Cooling gone? Call before you open the doors
Every hire includes 24/7 roadside assistance and a replacement vehicle. Ring us with the van, your location and what is in the back, and keep the shutter down until we tell you otherwise.