Daimler Trucks Recalls Thomas Built Buses Due to Hot Coolant Leak Risk

Source: NHTSA · United States

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Daimler Trucks North America is recalling over 2,800 school buses because improperly tightened heater hose clamps could 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, school-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) is recalling specific Thomas Built Buses school buses due to a manufacturing defect in the cooling system. The heater hose clamps on these vehicles may not have been tightened properly. This condition can cause the hose to disconnect, resulting in hot heating coolant leaking inside the passenger compartment.

Which Products Are Affected

The recall involves approximately 2,843 units. The following models and years are affected:

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

Official identification numbers for this recall include NHTSA Campaign Number 26V086000 and DTNA recall number F1030.

What You Should Do

DTNA is currently developing a remedy for the loose hose clamps. Owner notification letters are expected to be mailed by April 14, 2026. In the meantime, owners may contact DTNA customer service at 1-800-547-0712 to discuss the recall and any safety concerns.

Why This Matters

This defect poses a significant safety risk to passengers. Contact with hot heating coolant can cause serious burns to occupants, increasing the likelihood of injury inside the vehicle.

Source

This information is based on official reports from the National Highway Traffic Safety Administration (NHTSA).

Original source: NHTSA Official Notice ↗

All Vehicle Recalls →

Frequently Asked Questions

Common questions about this NHTSA vehicle recall.

What is this NHTSA vehicle recall about?
Daimler Trucks North America is recalling over 2,800 school buses because improperly tightened heater hose clamps could 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.