Engine Block Heater for International Navistar Maxxforce 5 & 7 VT365 VT275

Stop the "dry start" clatter and give your engine the warmth it needs to fire up like it’s mid-July.

High-Efficiency 1000W Engine Block Immersion Heater (27mm / 120V)

There is nothing harder on your internal bearings than a sub-zero cold start. This 1000W immersion heater is designed for "Car Guys" who live in the rust belt and northern climates where oil turns to sludge overnight. By heating the coolant directly inside the block, it ensures your oil flows instantly and your cabin heater kicks on the second you turn the key.

This 27mm threaded unit is a common "Universal-Fit" OEM replacement for many Japanese and domestic heavy-duty applications. Because it uses a 27mm thread pitch, it replaces the factory frost plug or threaded coolant port specifically, ensuring a leak-free seal that won't blow out under cooling system pressure. The copper element is chosen specifically for its thermal conductivity and resistance to the electrolysis common in mixed-metal engine blocks.

Technical Specifications

Why You Need This Upgrade

• Instant Lubrication: Warms the block to reduce the viscosity of cold oil, preventing the metal-on-metal wear that occurs during the first 30 seconds of a winter start.
• Maximum Thermal Efficiency: Unlike "pad heaters" that sit on the oil pan, this immersion element sits directly in the coolant for a 100% heat transfer rate.
• Faster Defrosting: Since your coolant is already at operating temperature, your defroster will clear your windshield almost immediately after startup.
• Battery Preservation: A warm engine requires significantly less cold-cranking amps (CCA), extending the life of your battery and starter motor.

Installation & Fitment Notes

Installation requires draining your engine coolant and removing the designated 27mm port plug. Use a high-quality thread sealant to ensure a permanent, leak-free bond. After installation, refill your coolant and run the engine to bleed out any air pockets before plugging the heater into a grounded 120V outlet.

Protect your engine’s internal components and take the stress out of winter morning commutes with direct-immersion heat.