Daimler Trucks Recalls Thomas Built Buses Over Hot Coolant Leak and Burn Risk

Source: NHTSA · United States

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Daimler Trucks North America is recalling 364 Thomas Built Buses because improperly tightened heater hose clamps may leak hot coolant into the passenger compartment.

What this NHTSA vehicle recall tells you, and what most readers miss

This notice was issued by NHTSA on February 21, 2026 and geographically references United States. Its severity classification of "high" signals how the issuing agency weighs the risk of harm if no action is taken — "critical" and "high" tier alerts typically carry direct consumer actions, while "medium" and "low" tend toward informational guidance or monitoring advisories. The category it belongs to — Vehicle Recalls — determines the regulatory framework behind it, which shapes what remedies (refunds, replacements, recalls, evacuations) are available to affected individuals and who holds statutory responsibility for enforcement.

Most readers skim a notice like this, check whether they are personally affected, and move on. The more useful lens is to read it as a data point about the issuing system: how quickly NHTSA detected the hazard, how precise the geographic or product-identifier scope is, and whether similar notices have clustered in the same category or region in the last 90 days. Cluster patterns frequently precede a broader regulatory action — a single localized NHTSA vehicle recall is isolated; three of them within a quarter often indicate a supply-chain, infrastructure, or seasonal driver that will keep producing notices until something structural changes.

For decision-making, Areazine pairs each alert with the original agency URL, the full agency name, and a timestamp so you can verify the notice against the primary source before acting on it. Tags on this item (recall, product-safety, nhtsa, Buses) map to related alerts in the same area of risk — browsing them together gives a clearer picture than any single notice alone, because the shape of an ongoing issue only becomes visible across multiple sequential alerts.

What Happened

Daimler Trucks North America, LLC (DTNA) has issued a recall for specific Thomas Built Buses models due to a defect in the engine cooling system. According to the National Highway Traffic Safety Administration (NHTSA), heater hose clamps on these vehicles may not have been tightened properly during assembly. This failure can cause the hose to disconnect, leading to the leakage of hot heating coolant into the passenger compartment.

Which Products Are Affected

The recall affects a total of 364 units. The specific models and years involved are:

  • Thomas Built Buses Saf-T-Liner EFX: Model years 2023, 2024, and 2025.
  • Thomas Built Buses Saf-T-Liner HDX: Model years 2023, 2024, 2025, and 2026.

What You Should Do

Owners of the affected vehicles are encouraged to contact DTNA customer service at 1-800-547-0712. The manufacturer's internal identification number for this recall is F1030. While the remedy is currently under development, DTNA expects to mail official owner notification letters on April 14, 2026.

Why This Matters

This recall is significant because the leakage of hot coolant into the passenger area poses a direct threat to occupants. Contact with the hot fluid can cause serious burns, increasing the risk of injury for anyone on board the vehicle.

Source

Information provided by the National Highway Traffic Safety Administration (NHTSA) under Campaign Number 26V087000.

Original source: NHTSA Official Notice ↗

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Frequently Asked Questions

Common questions about this NHTSA vehicle recall.

What is this NHTSA vehicle recall about?
Daimler Trucks North America is recalling 364 Thomas Built Buses because improperly tightened heater hose clamps may leak hot coolant into the passenger compartment.
Which agency issued this alert?
This alert was issued by NHTSA. The original notice is available at the source link at the bottom of this article.
How severe is this alert?
This alert is classified as "high" severity. Take precautions and monitor for updates.
What area is affected?
This alert affects United States. Check with NHTSA for the most current geographic scope.
Where can I find more Vehicle Recalls updates?
Browse the full Vehicle Recalls feed on Areazine at areazine.com/recalls/vehicles/ for the latest updates from NHTSA and other agencies.