Smiths Truck Service
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Heavy-duty semi-truck radiator and cooling system detail
24/7 Mobile Roadside Repair

Coolant Leaks & Cooling System Repair

Coolant Leaks, Radiator & Cooling System Repair

Smiths Truck Service provides mobile heavy-duty semi-truck and trailer roadside help across North Carolina and Virginia, based in Mount Airy, NC.

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Symptoms & Causes
Cooling system repair

Warning signs of a coolant leak or overheating

A cooling-system fault on a heavy-duty semi truck rarely announces itself quietly. Here is what drivers notice first, and what may be behind it, before you call for mobile roadside help.

Heavy-duty truck radiator and coolant hoses in the engine bay
Radiator, hoses and water pump — the components most often behind a coolant loss.

Smiths Truck Service provides 24/7 mobile heavy-duty semi-truck and trailer roadside repair across North Carolina and Virginia, based in Mount Airy, NC. When a cooling-system fault strands you, these are the signs worth noting before you call — we cannot diagnose your specific truck remotely, but what you observe helps us prepare.

Common warning signs

  • Visible coolant leaks under the truck or on the road
  • Temperature gauge climbing or overheating in traffic or on grades
  • Coolant level dropping between fills
  • Radiator damage — bent fins, wet spots or a leaking core
  • Wet, swollen or split coolant hoses, especially at clamps and connections
  • Weeping from the water pump weep hole or thermostat housing

Possible causes

Those signs point to a range of faults: a hose that has aged out, a radiator core corroded through, a water pump seal failing, a thermostat stuck shut, or a leak at a connection that only shows under pressure. Pressure, heat and road conditions all affect what is found and what can be completed at the roadside.

If you are seeing any of these, pull over safely and call for 24/7 roadside help. You can also read how our roadside diagnostic checks work before you call.

How we diagnose roadside
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Roadside diagnostics

How we check a cooling-system fault

A clear sequence of checks at your truck's location, then an honest talk about what we found and what comes next — no guaranteed diagnosis or outcome.

01

Look for leaks and damage

We start by inspecting the truck for visible coolant leaks and damage — at the radiator, hoses, water pump and surrounding components.

02

Check cooling components

We check the relevant cooling-system components — hoses, clamps, the water pump and the thermostat — for the fault behind what you're seeing.

03

Discuss what we found

We walk you through the findings in plain terms, so you understand the fault and the options available to you at the roadside.

04

Talk through next steps

Together we discuss the available next steps — roadside work where the fault and conditions allow, or a shop where they don't.

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See repair options
Roadside repair options

What we can do at the roadside

Cooling-system work we may complete on site for your semi truck or trailer — with roadside completion depending on the fault and conditions, and some repairs needing a shop.

man in orange jacket and black pants standing on red and white freight truck during daytime
01

Coolant leaks & radiator repair

We trace visible coolant loss and radiator damage, then talk through what the fault and conditions on your truck allow us to do at the roadside.

Locating the source of a visible coolant leak
Checking the radiator for damage and blockage
Repair or replacement options for the fault found
Close-up of a heavy-duty diesel engine water pump and hoses
02

Water pumps, thermostats & hoses

We check the cooling components around the leak or overheating fault and discuss the next steps with you before any roadside work begins.

Water pump inspection and replacement where feasible
Thermostat checks for overheating faults
Hose and clamp replacement on site
Row of parked semi trucks in a rainy lot, captured in a dramatic black and white setting.
03

When the repair needs a shop

Not every cooling-system repair can be completed roadside. If the fault or conditions call for shop work, we explain the options so you can decide your next step.

Roadside completion depends on the fault and conditions
Clear explanation of what the diagnosis shows
Discussion of repair options before work starts
Roadside limits

Questions about cooling-system repairs

What can be attempted at the roadside, what may need a shop, and why repair options depend on the diagnosed fault and conditions.

Some coolant leaks can be addressed at the roadside, and some cannot. We inspect for visible leaks and damage, check the relevant cooling-system components, and talk through what we find with you before any work begins. Whether a repair is completed roadside depends on the fault and the conditions.

24/7 dispatch

Still unsure whether it is a roadside job?

Call and describe what your truck is doing. We will talk through what may be involved and what comes next.

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24/7 Roadside Dispatch

Call now for 24/7 roadside repair

Truck down on I-77, I-40, or US-52? Call Smiths Truck Service for mobile heavy-duty semi-truck and trailer roadside repair across North Carolina and Virginia. We will discuss your fault and available next steps — no guaranteed arrival times, and roadside completion depends on the fault and conditions.

Call 336-320-8509
24/7emergency roadside repair
~60 micoverage from Mount Airy, NC
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Calling is fastest for a truck that is down. This form is a secondary contact option — it does not confirm availability or an arrival time.