Purpose of Coolant and Antifreeze in Trucks

Types of Coolants for Heavy-Duty Vehicles

There are three main types of coolants commonly used in diesel engines and heavy-duty trucks:

• Hybrid Organic Acid Technology (HOAT)
• Inorganic Acid Technology (IAT)
• Organic Acid Technology (OAT)

Both HOAT and OAT are designed to provide long-lasting protection and include corrosion-prevention additives. These coolants are formulated to meet the specific demands of diesel engines found in vehicles such as buses, semis, and heavy-duty trucks.

What’s in Coolant?

Coolant and antifreeze formulations include three essential chemical components, each serving a critical role:

• Ethylene Glycol – Regulates the temperature of the engine.
• Water – Acts as the primary heat transfer medium.
• Additive Package – Prevents corrosion and protects internal engine components.

Failure to maintain proper coolant levels and concentration can lead to serious, irreversible damage to a truck's engine. When corrosion begins, it can rapidly spread and compromise the integrity of the entire cooling system.

Best Practices for Coolant Maintenance

Expert technicians recommend regular inspections to monitor both the volume and concentration of coolant in diesel engines. A sufficient amount of coolant helps prevent overheating, while the correct concentration—especially during cold weather—ensures adequate freeze protection.

Operators are encouraged to use an antifreeze refractometer to verify the coolant’s antifreeze levels during colder months, guaranteeing optimal performance and longevity of the cooling system.

Why Coolant Is Essential for Trucks

Water alone cannot offer the protection that coolant provides. Water tends to boil and evaporate under high temperatures and freeze in extremely low temperatures. Coolant and antifreeze are chemically formulated to avoid these issues, offering complete thermal management and corrosion protection.

The advanced chemical makeup of coolants like HOAT, IAT, and OAT ensures the engine's internal parts remain shielded from corrosion, effectively increasing the engine’s life span.

4 Key Benefits of Using Coolant and Antifreeze

1. Helps maintain optimum fuel economy
2. Reduces maintenance costs and vehicle downtime
3. Protects internal engine components
4. Prevents unexpected truck breakdowns

Final Thoughts

Without the crucial roles of coolant and antifreeze, truck engines would be vulnerable to damage in both hot and cold environments. These fluids protect vital engine systems and are integral to ensuring operational reliability and fuel efficiency.

Professionals recommend consistent coolant inspections and scheduled maintenance across all types of diesel trucks—whether semis, pick-ups, or fleet vehicles—to prevent downtime and avoid costly repairs due to engine overheating or system failures.