Receive and Inspect (2 to 4 hours)
We examine the full cooling system when the unit arrives. We check for visible damage, leaks, corrosion, and structural weakness before starting any work.
When a truck overheats on a Canadian highway, every minute costs money. Engine failures from cooling system problems are one of the top causes of unplanned fleet downtime. King Radiator HD Inc. has been solving this problem for fleets across Canada for over 57 years.
We repair, rebuild, and replace radiators for all major commercial truck brands including Kenworth, Peterbilt, Freightliner, Mack, Western Star, and International. Our average turnaround is 24 to 72 hours. Most repairs are diagnosed before we even quote you a price.
Whether your truck is sitting on a route in Ontario, Alberta, or anywhere across Canada, we get your cooling system back to full performance fast.
57+ years of industrial and heavy equipment radiator experience
10,000+ radiators serviced across Canada
Canada-wide fleet coverage from Ontario to Alberta and beyond
24 to 72 hour average repair turnaround time
Commercial trucks deal with extreme heat, long distances, and harsh road conditions. These are the most common cooling system failures we repair and why they matter.
Plastic and brass tanks crack under sustained highway pressure. This causes active coolant loss and rapid engine temperature spikes. Left unaddressed, a cracked tank will put an engine out of service entirely
Road debris, rust, and mineral buildup restrict airflow through the core. Reduced airflow means the engine cannot shed heat properly, especially under load. This is one of the most common causes of gradual overheating in fleet trucks.
Some leaks only appear under full load. Pressure testing is the only reliable way to identify them. We test every unit under load-simulated conditions before finalizing any repair.
Fin damage reduces the radiator’s ability to exchange heat. Even partial fin damage lowers efficiency across the entire cooling system, increasing fuel stress on the engine over time.
Hose failures happen suddenly and without much warning. A single failed connection during a long-haul run can empty a cooling system in minutes. We inspect every hose, clamp, and fitting as part of our standard diagnostic process.
Road salt is a major cause of long-term radiator failure in Canada. Corrosion weakens tank walls, fittings, and core structure over time. We identify corrosion damage early and address it before it leads to full system failure.
We repair and rebuild radiators for every major commercial truck brand in Canada. Our technicians are experienced with the specific cooling system requirements of each platform.
Not seeing your brand? Call us. If it runs a cooling system, we can service it.
The right decision depends on the condition of the unit, not guesswork. Here is a clear breakdown of when each option is appropriate:
| Option | When It Applies | Turnaround | Cost Level | Best For |
|---|---|---|---|---|
| Repair | Minor leaks, hose failure, small cracks | Same day to 1 day | Lowest | Early-stage cooling system issues caught quickly |
| Rebuild | Core damage, internal corrosion, multiple leaks | 1 to 3 days | Mid | Major cooling failure where core performance has dropped significantly |
| Replace | Structural failure, non-repairable core damage | Fast if in stock | Highest | Complete system failure where restoration is not viable |
Every recommendation we make is backed by pressure testing, thermal load analysis, and physical evaluation of the unit. We do not push for replacement unless it is genuinely necessary. Most cases are resolved through repair or rebuild saving fleet operators time, money, and capital expense.
We follow a structured process on every job. This ensures nothing is missed and every repair meets the demands of heavy-duty road use.
We examine the full cooling system when the unit arrives. We check for visible damage, leaks, corrosion, and structural weakness before starting any work.
We pressure-test every unit to find leaks that are not visible during a standard inspection. This is the most reliable method for identifying weak points inside the system.
Based on what the diagnostic reveals, we repair or fully rebuild the damaged core, tanks, and fins. All work is done to restore proper cooling performance under heavy-duty load conditions.
We flush the entire cooling system to remove rust, mineral deposits, and contaminated coolant. This step prevents blockages from returning after the repair is complete.
Every unit is tested under conditions that simulate real road use before we release it. This confirms that the repair will hold under the actual demands of your fleet's operations.
Cost varies based on the type of damage, the truck model, and whether repair, rebuild, or replacement is needed. Minor repairs tend to be the most affordable option. Full rebuilds involve more labour and parts. Fleet customers can ask about volume pricing and priority service options.
The most common signs include engine overheating, coolant leaking under the truck, a rising temperature gauge on the highway, steam from the engine area, low coolant levels that return frequently, and coolant that looks rusty or contaminated. If a driver notices any of these, the radiator should be inspected before the next long run.
In most cases, repair or rebuild is the right answer. Full replacement is only necessary when the unit is structurally failed and cannot be restored. Our technicians assess every unit before making a recommendation. We will not suggest replacement if the unit can be properly repaired.
Most standard repairs are completed in one to two days. Rush service is available for fleets dealing with active downtime. More complex rebuilds may take slightly longer depending on the condition of the unit and parts availability.
We service Kenworth, Peterbilt, Freightliner, Mack, Western Star, and International. Each repair is tailored to the specific cooling system design of the brand and model. If your truck brand is not listed, call us and we will likely service it.
Yes. Fleet operators with multiple units can contact us for volume pricing and scheduled maintenance agreements. We work with Canadian fleets of all sizes, from small regional operators to national carriers.
Contact us to discuss logistics. We work with fleet operators across Canada and can coordinate repairs based on your situation and location
Every hour a truck is off the road affects your fleet’s schedule and your bottom line. We provide fast, reliable truck radiator repair for commercial fleets across Canada with free diagnostic quotes, honest assessments, and turnaround times designed to minimize your downtime.
If your truck is overheating, leaking coolant, or running hot, do not wait. The longer a cooling problem goes unaddressed, the more it risks the engine.