Cummins 3411859 Replacement Thermostat for the B/K/QSM/NT engines

This OEM Cummins thermostat is designed for precise temperature management and reliable performance in Cummins B, K, QSM, and NT engines. It plays a crucial role in maintaining optimal engine temperatures, minimizing erratic coolant cycling, and ensuring a secure, leak-free installation for longevity and consistent operation.

B/K/QSM/NT Cummins 3411859 Replacement Thermostat

Key Benefits

• Compatible with B, K, QSM, and NT engines
• Regulates coolant flow for stable operating temperatures
• American-made for enhanced durability and trusted reliability
• OEM quality backed by a full factory warranty for peace of mind

How It Works

This thermostat controls the flow of low-temperature coolant from the radiator into the engine. By maintaining a predetermined temperature range, it prevents issues such as overheating or engine underperformance. A slower coolant response rate minimizes dramatic temperature shifts, ensuring that your engine consistently operates at peak performance. Always verify your engine serial number (ESN) before installation to ensure this part is the correct match for your application.

Quick Tips

• Confirm your Cummins engine part number or ESN at the time of purchase
• Replace promptly if you experience irregular coolant temperature cycling
• For additional genuine Cummins parts, visit our Cummins OEM Replacement Parts collection

This thermostat is a precision-engineered, dependable solution designed to keep your diesel engine performing at its best.