When you’re running over-the-road (OTR), your truck’s radiator is the lifeline that keeps your engine cool and your deliveries on schedule. A failing radiator can lead to overheating, lost revenue, and costly downtime. At Tri-State Diesel Repair, we provide expert radiator replacement services designed for hardworking diesel trucks. From cracks and leaks to full radiator failures, our technicians quickly identify the problem and install durable, high-performance replacements that keep your rig running strong.
Our shop in Belmont, NH, and fully equipped mobile units are ready to handle OTR breakdowns wherever they happen. Whether you’re hauling long-distance or running regional loads, we know downtime is not an option. With fast diagnostics, quality radiator replacements, and dependable service, Tri-State Diesel Repair helps OTR drivers get back on the road with confidence.

We understand the pressure OTR drivers face when their truck is sidelined. That’s why we deliver radiator replacement services with speed, precision, and honesty. With over 20 years of diesel repair experience, our team combines in-shop expertise with 24/7 mobile truck repair capabilities. We don’t just swap parts we ensure your cooling system is working at peak efficiency to prevent future breakdowns. For radiator replacement that puts drivers first, trust Tri-State Diesel Repair.
1. What are the signs I need a radiator replacement?
Overheating, coolant leaks, rust-colored fluid, or frequent low coolant levels are all signs your radiator may need replacing.
2. Can you replace a radiator roadside for OTR drivers?
Yes, depending on the severity and location. Our mobile truck repair units can handle many radiator replacements on-site.
3. How long does a radiator replacement take?
Most radiator replacements can be completed within a few hours, but it may vary depending on the truck’s make and condition.
4. What type of radiators do you use for replacements?
We use high-quality, heavy-duty radiators built for diesel engines and OTR applications to ensure reliability and durability.
5. Will a new radiator improve my truck’s performance?
Yes. A properly functioning radiator prevents overheating, improves fuel efficiency, and extends the life of your engine.

Tri-State Diesel Repair is a veteran-owned truck and trailer repair company based in Belmont, NH, offering expert mobile diesel repair, fleet maintenance, and roadside assistance across Lakes Region NH Trusted. Fast.
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